初二定語(yǔ)從句
介詞+關(guān)系詞
1)介詞后面的關(guān)系詞不能省略。
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 和where 互換。例如：
This is the house in which I lived two years ago. 這是我兩年前住過(guò)的房子。
This is the house where I lived two years ago.
Do you remember the day on which you joined our club? 還記得你加入我們俱樂(lè)部的那一天嗎?
Do you remember the day when you joined our club?
18.6 as, which 非限定性定語(yǔ)從句
由as, which 引導(dǎo)的非限定性定語(yǔ)從句，as和which可代整個(gè)主句，相當(dāng)于and this或and that。As一般放在句首，which在句中。例如：
As we know, smoking is harmful to ones health. 如我們所知，吸煙有害健康。
The sun heats the earth, which is very important to us. 太陽(yáng)使地球暖起來(lái)，這對(duì)我們?nèi)祟?lèi)很重要。
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。況且選he句意不通。
判斷關(guān)系代詞與關(guān)系副詞
方法一： 用關(guān)系代詞，還是關(guān)系副詞完全取決于從句中的謂語(yǔ)動(dòng)詞。及物動(dòng)詞后面無(wú)賓語(yǔ)，就必須要求用關(guān)系代詞；而不及物動(dòng)詞則要求用關(guān)系副詞。例如：
This is the mountain village where I stayed last year.
Ill never forget the days when I worked together with you.
判斷改錯(cuò)（注：先顯示題，再顯示答案，橫線(xiàn)；用不同的顏色表示出。）
（錯(cuò)） This is the mountain village where I visited last year.
�。ㄥe(cuò)） I will never forget the days when I spent in the countryside.
�。▽�(duì)） This is the mountain village （which） I visited last year.
�。▽�(duì)） Ill 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。此兩題錯(cuò)在關(guān)系詞的誤用上。
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。
例1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one
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