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。do可以出現(xiàn),也可以不出現(xiàn),但不能用其它動(dòng)詞代替。值得一提的是,在這些具有形容詞性質(zhì)的名詞之后,引導(dǎo)定語(yǔ)從句的關(guān)系代詞不能用who / whom.2. 動(dòng)詞短語(yǔ)先行成分這種動(dòng)詞短語(yǔ)既可是限定形式也可是非限定形式。一、“as / which” 特殊定語(yǔ)從句的先行成分1. 形容詞或形容詞短語(yǔ)作先行成分, 具有形容詞意義的介詞短語(yǔ)也可以充當(dāng)先行成分,如:My grandmother’s house was always of great importance to me, as my own is.在一定的語(yǔ)言環(huán)境里,有些名詞可以具有形容詞的性質(zhì)。s health.As是關(guān)系代詞。As we know, smoking is harmful to one39。I have got into the same trouble as he (has).例2. as可引導(dǎo)非限制性從句,常帶有39。在本題中,prevent由于是行為動(dòng)詞,所以正確選項(xiàng)應(yīng)為B。但不同之處主要有兩點(diǎn):(1) as 引導(dǎo)的定語(yǔ)從句可置于句首,而which不可。That 不能用于非限定性定語(yǔ)從句,it不為連詞,使由逗號(hào)連接的兩個(gè)句子并在一起在英語(yǔ)語(yǔ)法上行不通。2)The weather turned out to be very good, ___ was more than we could expect.A. what B. which C. that D. it答案B。s health.The sun heats the earth, which is very important to us.典型例題1)Alice received an invitation from her boss, ___came as a surprise.A. it B. that C. which D. he答案C. 此為非限定性從句,不能用 that修飾,而用which.,it 和he 都使后句成為句子,兩個(gè)獨(dú)立的句子不能單以逗號(hào)連接。As一般放在句首,which在句中。將“Whoever”、“what”分別用“Anyone who”、“all that”代替后,才是定語(yǔ)從句,先行詞分別是“Anyone”、“all”。 This is the house in which I lived two years ago.This is the house where I lived two years ago.Do you remember the day on which you joined our club?Do you remember the day when you joined our club?This is the reason why he came late.This is the reason for which he came late.(八)先行詞和關(guān)系詞二合一1)Whoever spits in public will be punished here. (Whoever 可以用 anyone who 代替) 2)The parents will use what they have to send their son to technical school. (what 可以用all that代替)但這兩句句子已經(jīng)不是定語(yǔ)從句了,是名詞性從句。2)that前不能有介詞。關(guān)系詞的選擇依據(jù)在從句中所做的成分,先行詞在從句中做主、定、賓語(yǔ)時(shí),選擇關(guān)系代詞 (who, whom, that, which, whose);先行詞在從句中做狀語(yǔ)時(shí),應(yīng)選擇關(guān)系副詞 ( where 地點(diǎn)狀語(yǔ),when 時(shí)間狀語(yǔ),why 原因狀語(yǔ)) 。而句2中, 主、謂、賓俱全,從句部分為句子的狀語(yǔ)表地點(diǎn),既可用副詞where,又因 in the museum詞組,可用介詞in + which 引導(dǎo)地點(diǎn)狀語(yǔ)。方法二: 準(zhǔn)確判斷先行詞在定語(yǔ)從句中的成分(主、謂、賓、定、狀),也能正確選擇出關(guān)系代詞/關(guān)系副詞。ll never forget the days (which) I spent in the countryside.習(xí)慣上總把表地點(diǎn)或時(shí)間的名詞與關(guān)系副詞 where, when聯(lián)系在一起。ll never forget