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非限定性定語(yǔ)從句是英語(yǔ)語(yǔ)法中從句的一種，是定語(yǔ)從句的分支之一。而關(guān)于非限定性定語(yǔ)從句的引導(dǎo)詞有哪些呢？

今天和小編一起重點(diǎn)來(lái)看看“介詞+關(guān)系代詞”引導(dǎo)的非限制性定語(yǔ)從句：

首先，講講什么是非限制性定語(yǔ)從句？

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)。

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

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。

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)

例句：

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.
他們對(duì)湯姆表示了感謝，因?yàn)闆](méi)有他的支持他們就不會(huì)成功。

These new neighbors，to whom I was introduced yesterday，have come here from Beijing.
這些鄰居是北京來(lái)的，昨天我被介紹同他們認(rèn)識(shí)了。

好了，以上就是“介詞+關(guān)系代詞”引導(dǎo)的非限制性定語(yǔ)從句的介紹，還請(qǐng)同學(xué)們?cè)谌粘５膶W(xué)習(xí)中一定要勤加練習(xí)，在具體的句子中加以理解，一切問(wèn)題就可以迎刃而解了。