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years ago.他不大可能找到他四十年前居住過(guò)的地方。(三) 限制性和非限制性定語(yǔ)從句(1)定語(yǔ)從句有限制性和非限制性兩種。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)。例如:This is the house which we bought last month.這是我們上個(gè)月買(mǎi)的那幢房子。(限制性)The house, which we bought last month, is very nice.這幢房子很漂亮,是我們上個(gè)月買(mǎi)的。(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.查理史密斯去年退休了,他曾經(jīng)是我的老師。My house, which I bought last year, has got a lovely garden.我去年買(mǎi)的那幢房子帶著個(gè)漂亮的花園。 This novel, which I have read three times, is very touching.這本小說(shuō)很動(dòng)人,我已經(jīng)讀了三遍。(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