3. why指原因 在定語從句中做原因狀語

　　(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.

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