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2015年職稱(chēng)英語(yǔ)考試衛(wèi)生類(lèi)語(yǔ)法匯總
限制性和非限制性定語(yǔ)從句
例如：
1)This is the house which we bought last month.（限制性)
The house,which we bought last month,is very nice.（非限制性)
2)當(dāng)先行詞是專(zhuān)有名詞或物主代詞和指示代詞所修飾時(shí)，其后的定語(yǔ)從句通常是非限制性的，例如：
Charles Smith,who was my former teacher,retired last year.
My house,which I bought last year,has got a lovely garden.
This novel,which I have read three times,is very touching.
3)非限制性定語(yǔ)從句還能將整個(gè)主句作為先行詞,對(duì)其進(jìn)行修飾,這時(shí)從句謂語(yǔ)動(dòng)詞要用第三人稱(chēng)單數(shù)，例如：
He seems not to have grasped what I meant,which greatly upsets me.
Liquid water changes to vapor,which is called evaporation.
說(shuō)明：關(guān)系代詞that和關(guān)系副詞why不能引導(dǎo)非限制性定語(yǔ)從句。
