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　　1. where指地點(diǎn)，在定語(yǔ)從句中做地點(diǎn)狀語(yǔ)用來(lái)表示地點(diǎn)的定語(yǔ)從句。

　　(1) Shanghai is the city where I was born.

　　(2) The house where I lived ten y ears ago has been pulled down.

　　2. when引導(dǎo)定語(yǔ)從句表示時(shí)間。在定語(yǔ)從句中做時(shí)間狀語(yǔ)也可做連接詞用

　　(1) I still remember the day when I first came to the school.

　　(2) The time when we got together finally came.

　　[注]表示時(shí)間"time"一詞的定語(yǔ)從句只用when引導(dǎo)，有時(shí)不用任何關(guān)系代詞，當(dāng)然也不用that引導(dǎo)。

　　By the time you arrived in London, we had stayed there for two weeks.

　　到你到達(dá)倫敦的時(shí)候，我們?cè)谀抢镆呀?jīng)待了兩個(gè)星期。

　　I still remember the first time I met her. 我仍然記得我第一次見(jiàn)到她。

　　Each time he goes to business trip, he brings a lot of living necessities, such as towels, soap, toothbrush etc。

　　每一次他去出差，他帶來(lái)了生活必需品，如毛巾，肥皂，牙刷等，很多。

　　3. why指原因 在定語(yǔ)從句中做原因狀語(yǔ)

　　(1) Please tell me the reason why you missed the plane.

　　(2) I don't know the reason why he looks unhappy today.

　　注意：關(guān)系副詞引導(dǎo)的從句可以由"介詞+關(guān)系代詞"引導(dǎo)的從句替換

　　(1) The reason why/ for which he refused the invitation is not clear,

　　(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.

　　注：1)介詞后面的關(guān)系代詞不能省略。

　　2)that前不能有介詞。

　　3) 某些在從句中充當(dāng)時(shí)間，地點(diǎn)或原因狀語(yǔ)的"介詞+關(guān)系詞"結(jié)構(gòu)可以同關(guān)系副詞when ,where和why 互換。

　　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.