(2)用關係代詞還是用關係副詞？
關係詞(包括關係代詞和關係副詞)是學習英語定語從句的關鍵。用關係代詞還是用關係副詞，一要看關係詞在從句當中作什麼成分;二要看關係詞所代表的是人、物、時間、地點還是原因;三要看所引導的是限定性定語從句還是非限定性定語從句。所以同樣的先行詞會有不同的關係詞，這是因為關係詞在從句當中擔當的作用不同而決定的。
例如：
This is the room where/in which we’ll celebrate the New Year. 這是我們將要在裡面慶賀新年的房間。(充當地點狀語)
This is the room(that /which)we’ll celebrate the New Year in. 這是我們將要在裡面慶賀新年的房間。(充當介詞賓語，可省略。)
This is the room which /that will be used for the celebration of the New Year. 這是那個將要被用來慶賀新年的房間。(充當主語)
This is the room (which/that) we’ll use for the New Year dinner party. 這是我們將要用來舉行新年晚宴的房間。(充當賓語，可省略。)
The reason (that /which) he had given was not sound enough. 他給的理由不夠充分。(充當賓語，可省略)
The reason why/for which he had done that was not sound enough. 他做那件事的理由不夠充分。(充當原因狀語)
This is the house where she lives.這是她住的房子。
【比較：This is the house (that/which) she has bought. 這是她買的房子。This is the house that/which I’ve told you is extremely expensive.這就是我和你說過極其昂貴的那幢房子。】
I met him in the year when I was first in Xi’an. 我剛到西安的那年遇到了他。
That is the reason why he did not come that morning. 那就是那天上午他沒來的原因。
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