9)主語以there be開頭

　　如：There is a seat in the corner that is still free.在那個角落還有個座位空著。

　　5.在從句中作賓語的關系代詞可以省去

　　關系代詞who, that, which, whom若在定語從句中作賓語，我們往往可以省去關系代詞

　　如：Tina likes the book (which/that) I gave her for her birthday. 蒂娜喜歡我作為生日禮物送給她的那本書。

　　I like the people (who) I work with.

　　6.關系副詞的用法

　　1)關系副詞when的用法

　　when引導限定性和非限定性定語從句，作定語從句中的時間狀語。其先行詞必須是表示時間的名詞，如day, year, time等。when可以用on which來替換。

　　如：I will never forget the day when I met you.我將永遠不會忘記我認識你那天。

　　I will never forget the day on which I met you.

　　注：先行詞是表示時間的名詞，若定語從句不是缺狀語，而是缺少主語或賓語，要用which或that來引導定語從句。

　　如：The day, which began brightly, ended with a violent storm.那天開始的時候還是晴空萬里，后來卻下起了暴風雨。(which作主語)

　　I will never forget the time which we spent on campus.我將永遠不會記我們在校園里共同度過的時光。(which作賓語)

　　I will never forget the time when we first met in the park.(when作時間狀語)

　　2)關系副詞where的用法

　　where 的先行詞必須是地點名詞，如place, house等，而且在定語從句中作地點狀語。可以用介詞+which替換。

　　如：This is the place where Jack parks his car.這是杰克存車的地方。

　　This is the place at which Jack parks his car.

　　注：與when類似，where在定語從句中作地點狀語。先行詞是表示地點的名詞，若定語從句缺主語或賓語，要用which或that 引導定語從句，不用where.

　　如：This is the town which I told you about before.這就是我從前和你提起過的那個城鎮。(which作賓語)

　　The library, which was built in the 1930s, needs to be renovated.那個建于20世紀30年代的圖書館需要重新修建了。(which作主語)

　　This is the town where I spent my childhood. (where作地點狀語)

　　3).關系副詞why 的用法

　　why用來表示原因，只引導限制性定語從句。先行詞是reason 等表示原因的名詞。why=for which.

　　如：He didn’t know the reason why he was dismissed. 他不知道為什么被解雇。

　　看一下2002年第41題：

　　The reason why I’m writing is to tell you about a party on Saturday.

　　注：

　　a)關系副詞when, where, why在非正式文體或口語中，都可以省略。

　　如：I will never forget the year (when) I graduated from college.我將永遠不會忘記我大學畢業的那一年。

　　There are several reasons (why) she left.有幾種他離開的理由。

　　This is the place (where) I lived five years.這是我住了五年的地方。