英语句型是什么意思
句式：句子的结构表达式 .如： there + be （is are was were ,will be hsa been ,..） + 名词。
+地点 .这个句型表示：某处有（即存在）某物 .这叫做句式 .句式很多 ,。
又如：主语 + be + too + adj.+ to + 动词原形 （不定式） + 不定式的 宾语 + 其它（时间 ,地点 ,方式等等状语） .这个句型表示：主语太 .了 以至于主语不能够作某事 .
语法就包含的内容很多 .如 .词法：名词（名词的功能作主语 ,宾语或。
动词：时态（共有 16 ） ,语态（主动和被动） ,语气（陈述语气 ,疑问 语气,感叹,强调,虚拟.等等） .
形容词：作定语 ,比较级 ,最高级 ,复合形容词的构造规则 ,.
副词：.
时态 ,人称,数的关系 ,等等 句法：简单句 ,复合句 ,各种从句 .
句式严格说不属于语法 . 句式是学习单词的另一种形式 , 不过不是单独第记忆某个单词而已 ,而是记住某种习惯句型的表达法 .
句型 1。
可靠的信息源 a reliable source of information。
宝贵的自然资源 valuable natural resources。
因特网 the internet （ 一定要由冠词，字母 i 大写 ）。
方便快捷 convenient and efficient。
在人类生活的方方面面 in all aspects of human life。
环保的材料 environmentally friendly materials。
社会进步的体现 a symbol of society progress。
大大方便了人们的生活 sth has greatly facilitated peoples lives.
对这一问题持有不同态度 hold different attitudes towards this。
issue。
在一定程度上 to some extent。
理论和实践相结合 integrate theory with practice。
…必然趋势 an irresistible trend of …。
日益激烈的社会竞争 the increasingly keen social competition。
眼前利益 immediate interest/ short—term interest。
长远利益 long—tem interest。
…有其自身的优缺点 … has its own merits and demerits / pros and cons。
对…有害 do harm to / be harmful to / be detrimental to。
交流思想 / 情感/ 信息 exchange ideas / emotions / information。
跟上…的最新发展 keep pace with / keep abreast with the latest development of …。
…的健康发展 the healthy development of …。
重视 attach great importance to …。
社会地位 social status。
把时间和精力放在 … 上 focus ones time a nd energy on …。
扩大知识面 expand ones scope of knowledge。
身心两方面 both physically and mentally。
有直接 /间接关系 be directly / indirectly related to。
导致很多问题 give rise to / lead to / spell various problems。
可以替代 think 的词 believe, claim, maintain, argue, insist, hold the opinion / belief / view that。
缓解压力 / 减轻负担 relieve stress / burden。
优先考虑 /发展… give (top) priority to sth.
与…比较 compared with … / in comparison with。
可降解的 /可分解的材料 degradable / decomposable material。
代替 replace / substitute / take the place of。
提供就业机会 offer job opportunities。
反映了社会进步的 mirror the social progress/advance。
增进相互了解 enhance / promote mutual understanding。
充分利用 make full use of / take advantage of。
承受更大的工作压力 suffer from heavier work pressure。
保障社会稳定和繁荣 guarantee the stability and prosperity of our society。
更多地强调 put more emphasis on …。
适应社会发展 adapt oneself to the social development。
实现梦想 realize ones dream。
主要理由列举如下 the main / leading reasons are listed as follows:。
我们还有很长的路要走 we still have a long way to go.
不用说？
it goes without saying that 子句。
= (it is) needless to say (that) 子句。
= it is obvious that 子句。
= obviously, s. + v.
例：不用说早睡早起是值得的。
it goes without saying that it pays to keep early hours.
…是不可能的；无法… there is no ving。
= there is no way of ving.
= there is no possibility of ving.
= it is impossible to v.
= it is out of the question to v.
= no one can v.
= we cannot v. 例：不可否认的 ？成功的事业关键在于健康的身心。
there is not denying that successfulbusiness lies in a healthy body and mind.
我深信 …。
i am greatly convinced (that) 子句 = i am greatly assured (that) 子句。
例：我深信预防是于治疗。
i am greatly convinced that prevention is better than cure.
在各种 … 之中 ？… among various kinds of ……, = of all the … , …。
例：在各种运动中 ？我尤其喜欢慢跑。
among various kinds of sports, i like jogging in particular.
…是很容易证明的。
it can be easily proved (that) 子句 例：时间最珍贵是很容易证明的。
it can be easily proved that nothing is more precious than time.
…无论如何强调都不为过。
… cannot be overemphasized。
例：交通安全的重要性无论如何强调都不为过。
the importance of traffic safety cannot be overemphasized.
就我的看法？…；我认为…。
TOC \o "1—5" \h \z in my opi nion, …。
= to my mind, ….
= as far as i am concerned, …。
= i am of the opinion that 子句 例：就我的看法 ？打电动玩具既花费时间也有害健康。
in my opinion, playing video gamesnot only takes much time but is also harmful to health.
(a) 每个人都知道 … everyone knows (that) 子句。
(b) 就我所知 ？… as far as my knowledge is concerned, …。
例：就我所知 ？下列方法对我帮助很大。
as far as my knowledge is concerned, the following ways are of great help to me.
毫无疑问地 ？…。
there is no doubt (that) 子句 例：毫无疑问地 ？近视在我国的年轻人中是一个严重的问题。
there is no doubt that near—sightedness is a serious problem among the youth of our country.
根据我个人经验 ？…。
according to my personal experience, …。
= based on my persona l experience, … 例：根据我个人经验 ？微笑已带给我许多好处。
according to my personal experience, smile has done me a lot of good.
在我认识的人当中 ？也许没有一个人比 …更值得我尊敬。
of all the people i know, perhaps non deserves my respect more than …。
例：在我认识的人当中 ？也许没有一个人比我的英文老师张老师更值 得我尊敬。
of all the people i know, perhaps non deserves my respect more than miss chang, my english teacher.
在我的求学过程中 ？ 我忘不了 …。
in the course of my schooling. i willnever forget …。
例：在我的求学过程中 ？我忘不了学习英文所遭到的大困难。
in the course of my schooling. i willnever forget the great difficulty i encountered in learning english.
(a)随着人口的增加？ with the increase/growth of the。
populati on, …。
(b) 随着科技的进步 , …with the advanee of scienee and technology, …。
例：随着台湾经济的快速发展 ？许多社会问题产生了。
with the rapid development of taiwans economy, a lot of social problems have come to pass.
(a)在这信息的年代？…扮演重要的角色。
in the age of information and communication, … plays an。
important role.
(b)在今日工业社会中？是生命不可或缺的。
in todays industrial society, … is indispensable to life.
例：在这信息的年代 ？计算机扮演非常重要的角色。
in this age of information and communication, the computer playsan extremely important role.
在讨论…？ 一个人不得不承认 …。
in dealing with …, one cannot but admit (that) 子句 例：在讨论未来的职业 ？一个人不得不承认尽早决定未来的职业很重 要。
in dealing with ones future career, one cannot but admit that it is very important to decide ones future career as early as possible.
世上没有什么比…更令我高兴。
nothing in the world can delight meso much as …。
例：世上没有什么比到快餐店吃汉堡更令我高兴。
nothing in the world can delight meso much as having hamburgers in fast—food restaurants.
…是必要的 it is necessary that s (should) v。
… 是重要的 it is important/essential that s (should) v。
… 是适当的 it is proper that s (should) v。
… 是紧急的 it is urgent that s (should) v 例：我们当保持公共场所清洁是应当的。
it is proper that we (should) keep the public places clean.
每当我听到…？我就忍不住感到兴奋。 whenever i hear …,i。
cannot but feel excited.
每当我做…？ 我就忍不住感到悲伤。
whenever i do …,i cannot butfeel sad.
每当我想到…？我就忍不住感到紧张。 whenever i think of …,i。
cannot but feel nervous.
每当我遭遇 …？我就忍不住感到害怕。 whenever i meet with …,i。
cannot but feel frightened.
每当我看到… 我就忍不住感到惊讶。
whenever i see …, i cannot but feel surprised.
例：每当我想到我家附近那一条清澈的小溪 ？我就忍不住感到悲伤。
whenever i think of the clean brooknear my home, i cannot but feel sad.
= every time i think of the clean brook near my home, i cannot help feeling sad.
据说… it is said (that) 子句 一般认为… it is thought (that) 子句 大家都知道… it is known (that) 子句 据报导… it is reported (that) 子句 一般预料… it is expected (that) 子句 一般估计… it is estimated (that) 子句 一般相信… it is believed (that) 子句 例：一般相信阅读增加我们的知识、扩大我们的心胸。
it is believed (that) reading increases our knowledge and broadens our mind.
…的主要理由是…。
the main reason why …..is (that)子句 例：青少年犯罪的主要理由是社会环境日一败坏。
the main reason why the juveniles commit crimes is that social environment is becoming worse.
俗语说得好：「 …」。
TOC \o "1—5" \h \z well goes an old saying, …。
= as an old saying goes(runs, says), …。
= an old saying goes, …。
= its an old saying (that) 子句 例：俗话说得好：「诚实为上策」。
as an old saying goes, honesty is the best policy.
(a) 用…下列方法… … in the following ways. (b) …有三个主要理由。
… for three major reasons.
(c)要…？至少我们可做三件事。
to …,there are at least three things we can do.
例：(a)我用下列方法增加信心。
i increase my confidence in the following ways.
人们学外语有三个理由。
people learn a foreign language forthree major reasons.
为了维护健康 ? 我们每天至少可做三件事。
to keep healthy, there are at least three things we can do every day.
ii. 用于文章承转句。
那就是(说)…；亦即…。
that is to say, …。
= that is, …。
= namely, …。
例：我们生活需有规律。也就是说 ?早睡早起 ?戒除烟酒。
we need to live a regular life. that is, we can keep good hours and refrain from smoking and drinking in the daily activities.
(a) 基于这个理由 ?… for this reason, …。
(b) 为了这个目的 ?… for this purpose, … 例：基于这个理由 ? 我已决定把行医作为未来的职业。
for this reason, i have decided to take practicing medicine as my future career.
我们有理由相信 …。
we have reasons to believe (that) 子句 例：我们有理由相信体罚应该严格禁止。
we have reasons to believe that corporal punishment should be strictly prohibited.
事实上 ?…。
as a matter of fact, …。
= in fact, …。
例：事实上 ?健康才是最重要。
as a matter of fact, it is health that counts.
(a) 例如 ?… for example, …。
(b) 拿… 做例子 take … for example.
例：例如 ? 我们盲目地提高生活水准 ? 却降低生活品质。
for example, we elevate the living standards blindly, but lower the quality of life.
此外 ?我们不应忽视 …。
besides (i n addition), we should notneglect …。
例：此外？我们不应忽视每个人都想要一个温馨祥和的社会。
in addition, we should not neglect that everyone wants a friendly and peaceful society.
相反地 ？…。
on the contrary, …。
= by contrast, …。
例：相反地 ？少数学生似乎还在鬼混。
on the contrary, a few students, it seems, are still fooling around.
另一方面 ？…。
on the other hand, …。
例：政府应严格执法 ？另一方面 ？大众也应该培养减少污染的好习惯。
the government should enforce laws strictly. on the other hand, thepublic also should develop the goodhabit of reducing pollution.
然而 ？很可惜的是 …。
however, it is a pity that 子句。
例：然而 ？很可惜的是他总是临时抱佛脚。
however, it is a pity that he should always cram at the eleventh hour.
换言之 ？…。
in other words, …。
= to put it differently。
例：换言之 ？我会尽最大的努力达成我的目标。
in other words, i will try my best toattain (gain, live up to) my goal.
别人可能认为这是事实 ？ 但我不是。我认为 …。
it may be true as assumed by others, but i dont. i believe that。
子句 例：别人可能认为这是事实 ？但我不是。我认为 … it may be true as assumed by others, but i dont. i believe that if you have strong determination and perseverance, the success will certainly come to you in the end.
从此之后 ？我已发现 …。
ever since then, i have found that 子句。
例：从此之后 ？我已发现 …。
ever since then, i have found smile the best way to avoid any possible conflicts in our daily lives.
这样说来？假如…？当然毫无疑问地 …。
in this light, if …,there can surely be no doubt (that)子句。
例：这样说来？假如我们能善用时间？当然毫无疑问地我们会成功 in this light, if we can make good use of time, there can surely be no doubt that we will get somewhere.
更严重的是 ？… 。
what is more serious is (that) 子句。
例：更严重的是 ？我们不珍惜野生动物。
what is more serious is that we do not cherish the wildlife.
鉴于社会的实际需要 ？… 。
in view of the practical need of society, ….
例：鉴于社会的实际需要 ？愈来愈多人对学英语有兴趣。
in view of the practical need of society, there are more and more people interested in learning english.
iii. 用于文章结论句。
如果能实践这三点 ？… 。
if one can really put the three points into action (practice), 例：如果能实践这三点 ？… 。
if one can really put the three points into action(practice), he。
will surely be able to live a healthy and happy life.
做这些简单之事 ？我们一定可以 …。
by doing these simple things, we surely can ….
例：做这些简单之事 ？我们一定可以快乐出门平安回家。
by doing these simple things, we surely can go out of the door happily and come back home safe every day.
如此？我相信 …。
in this way, i believe (that) 子句。
例：如此 ？我相信大家能够像我一样 ？享受乘坐公车的乐趣。
in this way, i believe that all the people may be able to enjoy。
the bus ride like me.
实践这些 ？… 。
by putting them (the above) into practice, ….
例：实践这些 ？在智育方面我一直能不断进步。
by putting them(the above) into practice, i have been able to make constant progress in intellectual education.
(a) 唯有符合此三项要求 ？我们才能 …。
only by liv ing up to the three requireme nts, can we。
(b)唯有通力合作？我们才能…。
only with comb ined efforts, can we。
例：唯有通力合作？我们才能期望台湾不久有新的面貌。
only with combined efforts, can we expect taiwan to take a new。
face in due course.
最后 ？但并非最不重要 ？… 。
last but no least, ….
例：最后 ？但并非最不重要 ？教育上的缺失是助长青少年犯罪的原因 last but no least, the shortcoming in education is the cause contributing to juvenile delinquency.
这证据显示?的重要性在怎么强调都不为过。
this evide nee shows that the importa nee of ?cannot be。
overemphasized.
例：这证据显示交通安全的重要性在怎么强调都不为过。
this evidence shows that the importance of traffic safety cannot be overemphasized.
由于这些理由？我…。
for these reasons, i ….
例：由于这些理由 ？我认为在台湾接受大学教育是明智的。
for these reasons, i think that receiving college education in taiwan is wise.
总而言之 ？… 。
in conclusion, …。
= to sum up, …。
例：总而言之 ？好国民应该遵守交通规则。
in conclusion, a good citizen should abide by traffic regulations.
因此？我们能下个结论 ？那就是 …。
we can, therefore, come to the conclusion (that) 子句。
例：因此 ？我们能下个结论 ？那就是世上自由罪珍贵。
we can, therefore, come to the conclusion that nothing is so precious as freedom in the world.
如果我们能做到如上所述 ？毫无疑问地 ？… 。
if we can do as mentioned above, there can be no doubt (that) 子句。
例：如果我们能做到如上所述 ？毫无疑问地 ？我们就能精通英语。
if we can do as mentioned above, there can be no doubt that。
we can master english。
因此？这就是…的原因。
thus, this is the reas on why。
例：因此？这就是我重感冒的原因。
thus, this is the reason why i caught a bad cold.
所以？我们应该了解 …。
therefore, we should realize (that) 子句。
例：所以 ？我们应该了解学英文不能没有字典。
therefore, we should realize that in learning english we cannot do without a dictionary.
因此 ？由上列的讨论我们可以明了 …。
we, therefore, can make clear fromthe above discussion (that)。
子句。
例：因此 ？由上列的讨论我们可以明了毅力可以克服任何困难。
we, therefore, can make clear fromthe above discussion that perseverance can overcome any difficulty.
1.从?观点来看？…。
from the ?point of view,。
根据?的看法 ？… 。
according to ? point of view, …. 例：从政治的观点来看 ？这是一个很复杂的问题。
from the political point。
定语从句是由关系代词和关系副词引导的从句，其作用是作定语修 饰主句的某个成分，定语从句分为限定性和非限定性从句两种。状 语从句分为从句，结果状语从句，让步状语从句，原因状语从句， 条件状语从句以及行为方式状语从句。名词从句包括主语从句，宾 语从句，表语从句和同位语从句及 there be 句型。
一、 1. that 即可代表事物也可代表人， which 代表事物；它们在从 句中作主语或宾语， that 在从句中作宾语时常可省略关系词， which 在从句中作宾语则不能省略。而且，如果 which 在从句中作 “不及物 动词＋介词 ”的介词的宾语，注意介词不要丢掉，而且介词总是放在 关系代词 which 的前边，但有的则放在它原来的位置 2. which 作宾 语时，根据先行词与定语从句之间的语义关系，先行词与 which 之 间的介词不能丢 3. 代表物时多用 which ，但在带有下列词的句子中 用 that 而不用 which ，这些词包括 all, anything, much 等，这时的 that 常被省略 4. who 和 whom 引导的从句用来修饰人，分别作从 句中的主语和宾语， whom 作宾语时，要注意它可以作动词的宾语 也可以作介词的宾语 5. where 是关系副词，用来表示地点的定语从 句 6. whe... 定语从句 定语从句是由关系代词和关系副词引导的从句，其作用是作定语修 饰主句的某个成分，定语从句分为限定性和非限定性从句两种。状 语从句分为从句，结果状语从句，让步状语从句，原因状语从句， 条件状语从句以及行为方式状语从句。名词从句包括主语从句，宾 语从句，表语从句和同位语从句及 there be 句型。
一、。
that 即可代表事物也可代表人， which 代表事物；它们在从句中 作主语或宾语， that 在从句中作宾语时常可省略关系词， which 在 从句中作宾语则不能省略。而且，如果 which 在从句中作 “不及物动 词＋介词 ”的介词的宾语，注意介词不要丢掉，而且介词总是放在关 系代词 which 的前边，但有的则放在它原来的位置。
which 作宾语时，根据先行词与定语从句之间的语义关系，先行 词与 which 之间的介词不能丢。
代表物时多用 which ，但在带有下列词的句子中用 that 而不用 which ，这些词包括 all, anything, much 等，这时的 that 常被省略。
who 和 whom 引导的从句用来修饰人，分别作从句中的主语和宾 语， whom 作宾语时，要注意它可以作动词的宾语也可以作介词的 宾语。
when 引导定语从句表示时间 〔注〕值得一提的是，表示时间 “time 一词的定语从句只用 when 引 导，有时不用任何关系代词，当然也不用 that 引导 by the time you arrive in london, we will have stayed there for two weeks.
i still remember the first time i met her.
each time he goes to besiness trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc.
whose 是关系代词，修饰名词作定语，相当于所修饰成分的前置 所有格。
当从句的是 some, any, no, somebody, anybody, nobody, something, anything, everything 或 nothing 时，常用 there is 来 引导。
二、非：非限定性定语从句的作用是对所修饰的成分作进一步说明， 通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立。
which 引导的非限定性定语从句来说明前面整个句子的情况或主 句的某一部分。
在引导限定性定语从句时， that 有时相当于 in which, at which, for which 或 at which。
attitudes towards daydreaming are changing in much the same。
way that(in which) attitudes towards night dreaming have。
changed. 人们对白日做梦的态度正在改变，这与人们对夜间做梦的 看法的变化有非常相似之处。
i like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐，而他恰恰与我相反。
we arrived the day that(on which) they left. 刚好我们到的那天他。
们走了。
在非限定性定语从句中，不能用 that ，而用 who, whom 代表人， 用 which 代表事物 .
定语从句：修饰一个名词或代词的从句称为定语从句，一般紧跟在 它所修饰的先行词后面。
关系词：引导定语从句的关联词成为关系词 关系词有关系代词和关系副词。关系代词有 that, which, who, whom, whose, as 等；关系副词有 where, when, why 等。
2，代替先行词。
3，在定 语从句中担当一个成分。
the boys who are playing football are from class one.
yesterday i helped an old man who lost his way.
mr. liu is the person (whom) you talked about on the bus.
mr. ling is just the boy whom i want to see.
注意：关系代词 whom 在口语和非正式语体中常用 who 代替，可省 略。
the man who/whom you met just now is my friend.
which 指物，在定语从句中做主语或者宾语，做宾语时可省略。
football is a game which is liked by most boys.
this is the pen (which) he bought yesterday.
that 指人时，相当于 who 或者 whom；指物时，相当于 which 。
(5) the number of the people that/who come to visit the city each year rises one million.
(6) where is the man that/whom i saw this morning?。
he has a friend whose father is a doctor.
i once lived in a house whose roof has fallen in. whose 指物时，常用以下结构来代替。
the classroom whose door is broken will soon be repaired.
the classroom the door of which is broken will soon be repaired.
do you like the book whose cover is yellow?。
do you like the book the color of which is yellow?。
介词 +关系代词引导的定语从句 关系代词在定语从句中做时，从句常由介词 +关系代词引导。
the school (that/which) he once studied in is very famous.
the school in which he once studied is very famous.
tomorrow i will bring here a magazine (that/which) you asked for.
tomorrow i will bring here a magazine for which you asked.
we ll go to hear the famous singer (whom/that/who) we have often talked about.
we ll go to hear the famous singer a bout whom we have often talked.
注意： 1. 含有介词的一般不拆开使用，如： look for, look after, take care of 等。
this is the watch which/that i am looking for. (t)。
this is the watch for which i am looking. (f)。
2. 若介词放在关系代词前，关系代词指人时用 whom ，不可用 who 或者 that；指物时用 which ，不能用 that；关系代词是所有格时用 whose。
the man with whom you talked is my friend. (t)。
the man who/that you talked with is my friend. (f)。
the plane in which we flew to canada is very comfortable. (t)。
the plane in that we flew in to canada is very comfortable. (f)。
“介词+关系代词”前可有 some, any, none, both, all, neither, most, each, few 等代词或者数词。
he loved his parents deeply, both of whom are very kind to him.
in the basket there are quite many apples, some of which have gone bad.
there are forty students in our class in all, most of whom are from big cities.
i still remember the day when i first came to the school.
the time when we got together finally came.
(2) the house where i lived ten years ago has been pulled down.
please tell me the reason why you missed the plane.
i don t know the reason why he looks unhappy today.
注意：关系副词引导的从句可以由 “介词+关系代词”引导的从句替换。
the reason why/ for which he refused the invitation is not clear,。
from the year when/in which he was going to school he began to know what he wanted when he grew up.
great changes have taken place in the city in which./where i was born.
五．限制性定语从句和非限制性定语从句 限制性定语从句 非限制性定语从句 形式上不用逗号和主句隔开 用逗号和主句隔开 意义上是先行词不可缺少的定语，不能删除 是对先行词的补充说明， 删除后意思仍完整。
译法上 翻译成先行词的定语， “的…”通常翻译成主句的并列句。
c .可用who代替whom a .不可省b。不用that。
c。不用 who 代替 whom。
(1) the teacher told me that tom was the only person that i could depend on.
(2) china is a country which has a long history. 非限制性定语从句举例：
(1) his mother, who loves him very much, is strict with him.
(2) china, which was founded in 1949, is becoming more and more powerful.
要注意区分以下几个句子的不同。
(1) his brother who is now a doctor always encourages him to go to college.
他那当医生的哥哥常鼓励他要考上大学。(他还有其他的哥哥) (2) his brother, who is now a doctor, always encourages him to go to college.
他的哥哥是当医生的，常鼓励他要考上大学。(他只有一个哥哥) 难点分析。
1．当先行词是 anything, everything, nothing (something 除外 ), few, all, none, little, some 等代词时，或者是由 every, any, all, some, no, little, few, much 等修饰时。
(1) have you taken down everything that mr. li has said?。
(2) there seems to be nothing that seems impossible for him in the world.
all that can be done has been done.
there is little that i can do for you. 注意：当先行词指人时，偶尔也可以用 who。
any man that/.who has a sense of duty won t do such a。
thing.
2. 当先行词被序数词修饰。
(1) the first place that they visited in london was the big ben.
3. 当先行词被形容词最高级修饰时。
(1) this is the best film that i have seen.
当形容词被 the very, the only 修饰时。
(1) this is the very dictionary that i want to buy,。
(2) after the fire in his house, the old car is the only thing that he owned.
当先行词指人时，偶尔也可以用 who。
wang hua is the only person in our school who will attend the meeting/。
当先行词前面有 who, which 等时。
(1) who is the man that is standing there?。
(2) which is the that fits me most?。
当先行词既有人，也有动物或者物体时。
(1) can you remember the scientist and his theory that we have learned?。
as 和 which 引导非限制性定语从句，有相同之处也有不同之处。具 体情况是：
1． as 和 which 都可以在定语从句中做主语或者宾语，代表前面整 个句子。
(1) he married her, as/which was natural.
(2) he was honest, as/which we can see.
2. as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚 至可以切割一个主句； which 引导的非限制性定语从句只能放在主 句之后。另外，as有正如……，正像……”的意思。
as is known to all, china is a developing country.
he is from the south, as we can see from his accent.
john, as you know。