when非限定性定語(yǔ)從句用法

　　導(dǎo)語(yǔ)：關(guān)系副詞when在非限制性定語(yǔ)從句中作時(shí)間狀語(yǔ)，指代主句中表示時(shí)間的詞語(yǔ)。下面是小編給大家整理的when非限定性定語(yǔ)從句用法的相關(guān)內(nèi)容，希望能給你帶來(lái)幫助!

　　非限定性定語(yǔ)從句起補(bǔ)充說(shuō)明作用，缺少也不會(huì)影響全句的理解，它與主句往往用逗號(hào)隔開(kāi)。定語(yǔ)從句有限制性和非限制性?xún)煞N。限制性定語(yǔ)從句是先行詞不可缺少的部分，去掉它主句意思往往不明確；非限制性定語(yǔ)從句是先行詞的附加說(shuō)明，去掉了也不會(huì)影響主句的意思，它與主句之間通常用逗號(hào)分開(kāi)，將非限定性定語(yǔ)從句放在句子中間，其前后都需要用逗號(hào)隔開(kāi)。

　　when非限定性定語(yǔ)從句用法

　　when引導(dǎo)

　　關(guān)系副詞when在非限制性定語(yǔ)從句中作時(shí)間狀語(yǔ)，指代主句中表示時(shí)間的詞語(yǔ)。

　　如：He will put off the picnic until May 1st, when he will be free.

　　他將把郊游推遲到5月1號(hào)，那時(shí)他將有空。

　　where引導(dǎo)

　　副詞where在非限制性定語(yǔ)從句中作地點(diǎn)狀語(yǔ)，指代主句中表示地點(diǎn)的詞語(yǔ)。

　　如：They went to London，where they lived for six months.

　　他們?nèi)チ藗惗�，在那兒呆了六個(gè)月的時(shí)間。

　　as引導(dǎo)

　　as引出非限定性定語(yǔ)從句時(shí)，代替整個(gè)主句，對(duì)其進(jìn)行說(shuō)明但通常用于像as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在非限定性定語(yǔ)從句中作主語(yǔ)、表語(yǔ)或賓語(yǔ)，且引出的'從句位置比較靈活，可位于句首或句末，也可置于主句中間。通常均由逗號(hào)將其與主句隔開(kāi)。as有“正如……， 就像……”之意。

　　如：As is known to the United States, Mark Twain is a great American writer.

　　美國(guó)人都知道，馬克·吐溫是一位偉大的美國(guó)作家。（as在從句中作主語(yǔ)）

　　He forgot to bring his pen with him, as was often the case.

　　他忘了帶筆，這是常事。（as在從句中作主語(yǔ)）

　　He is absorbed in work, as he often was.

　　他正在全神貫注地工作，他過(guò)去經(jīng)常這樣。（as在從句中作表語(yǔ)）

　　As we all know, the earth is round.

　　眾所周知，地球是圓的。（as在從句中作賓語(yǔ)）

　　The two brothers were satisfied with this decision，as was agreed beforehand.

　　兩兄弟對(duì)此決定都滿(mǎn)意，這項(xiàng)決定在事前都已得到他們的同意。(as在從句中作主語(yǔ))

　　Taiwan is，as you know，an inseparable part of China.

　　你知道，臺(tái)灣是中國(guó)不可分割的一部分。(as在從句中作賓語(yǔ))

　　“介詞+關(guān)系代詞”引導(dǎo)非限制性定語(yǔ)從句：在介詞后引導(dǎo)非限制性定語(yǔ)從句。

　　難：句意相同

　　as it is known to all (that...) (as 做狀語(yǔ)從句連詞，是狀語(yǔ)從句, 可以加that)

　　與 as is known to all (as做主語(yǔ)，是定語(yǔ)從句)

　　與 it is known to all that... (主語(yǔ)從句，it是形式主語(yǔ))

　　即：As is widely known, the moon is closer to the us than the sun.(定從)

　　= That the moon is closer to the us than the sun is widely known.(主從)

　　= It is widely known that the moon is closer to the us than the sun.(主從)

　　As it is known to everyone, I thought you knew about it too.(狀從)[1]

　　關(guān)系代詞which有時(shí)并不代表主句中某一確定的詞，而是概括整個(gè)主句的意思。介詞的選擇取決于它與先行詞的搭配或與從句中謂語(yǔ)動(dòng)詞的搭配。

　　They were short of sticks to make frames for the climbing vines，without which the yield would be halved.

　　他們?nèi)贝钇咸鸭艿臈U兒，沒(méi)有它們產(chǎn)量會(huì)減少一半。

　　They thanked Tom，without whose support they would not have succeeded.

　　他們很感激Tom，沒(méi)有他的支持他們是不會(huì)成功的。

　　特殊結(jié)構(gòu)

　　“名詞/代詞+of+which / whom”

　　It now has 20，000 hectares of land，more than two-thirds of which are under cultivation.

　　現(xiàn)在它擁有兩萬(wàn)公頃土地，其中三分之二之多已經(jīng)耕種。

　　Light is the fast thing in the world, the speed of which is 300000 kilometer per second.

　　光是世界上最快的東西，它的速度是每秒30萬(wàn)千米。

　　There are 30 chairs in the small hall, most of which are new.

　　大廳里有三十把椅子，絕大部分是新的。

　　The textile mill has over 8，000 workers and staff，eighty per cent of whom are women.

　　這家紡織廠有8千多職工，女職工占百分之八十。

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