occasion定語從句

　　在定語從句，大家知道occasion的用法？放在句子的哪里呢？occasion在定語從句中作先行詞時，后面用關系副詞when還是where。

　　occasion在表示：

　　“a particular time or instance of an event（特定的）時刻；場合”時，定語從句引導詞用when；當表示：“a special or noteworthy event,ceremony,or celebration（儀式、慶典等）重大場合”時，定語從句引導詞用where。（新牛津英漢雙解大詞典）

　　例句：

　　1. In hard times,the Spring Festival was the only occasion where a family threw off the old attire and put on new clothes specially made for the festival.

　　2. Describe an occasion when you had to give a presentation to an audience.

　　例題：

　　1. Occasions are quite rare ____ I have the time to spend a day with my kids.

　　A. whoB. whichC. whyD. when

　　定語從句的十大考點：

　　1. that與which在指代物時的用法區別

　　that和which都可以引導先行詞為物的定語從句，但是用法有區別：

　　①只能用that的五種情況

　　a.先行詞為不定代詞或先行詞由不定代詞修飾時

　　b.先行詞前有最高級或序數詞修飾時

　　c.先行詞即有人又有物時

　　d.先行詞前有the very,the only修飾時

　　e.主句為which,或who引導的特殊疑問句時

　　②只能用which的兩種情況

　　a.非限定性定語從句中

　　b.介詞之后引導定語從句時

　　2．which與as的區別

　　as和which都可以引導非限制性定語從句，三種情況下只能用as，不能用which

　　a. as置于句首引導定語從句時（As we know,…）

　　b. as含有“正如”之意（…as we expected）

　　c.先行詞前有such,the same修飾時（…such an easy question as the little boy can answer.）

　　3. who、whom、that的區別

　　a.先行詞為those或people時，常用關系代詞who,不用that

　　b.介詞之后用關系代詞whom引導定語從句

　　4. whose用法

　　whose+n.引導定語從句的結構是定語從句的一個考查熱點，此結構可以換成是the+n.+of+which引導定語從句或者可以換成是of which +the+n.

　　e.g.The man pulled out a gold watch,the hands of which were made of small diamonds.

　　whose hands / of which the hands

　　5.介詞+關系代詞引導定語從句的用法

　　a.介詞之后的關系代詞只能用which（先行詞為物）或者是whom（先行詞為人）

　　b.介詞的選擇方法有三個原則：一“先”二“動”三“意義”

　　I lost my pen,with which I took notes. (先行詞為pen,使用鋼筆用with)

　　This is the house in which he lives. (定語從句中謂語動詞live為不及物動詞)

　　The gas is oxygen without which we can’t live. (根據句意決定)

　　6.先行詞為way時

　　先行詞為way，在定語從句中作狀語時，用that，in which引導定語從句，也可以省略關系詞。

　　e.g. I don’t like the way(that/in which) he speaks to his parents.

　　7.關系副詞when、where、when引導定語從句的具體用法

　　①先行詞表示時間、地點、原因時，在定語從句中作狀語，選擇相應的關系副詞when、where、why引導定語從句。若其在定語從句中作主語或賓語，則選擇關系代詞引導定語從句。區別三組例句：

　　where he lives.

　　a. This is the place

　　that/which he visited last year.

　　when my brother was a little boy.

　　b. I still remember the time

　　that/which we spent together.

　　why he was late.

　　c. This is the reason

　　that/which he gave us.

　　②某些非地點時間名詞有定語從句修飾，關系詞在從句中作狀語，由where引導定語從句（stage,case,point,situation）；同樣用法的還有occasion,由when引導定語從句。

　　e.g. I can think of many cases where students know a lot of words but don’t write a good essay.

　　There are many occasions when people don’t know what they want.

　　8.定語從句中的謂語動詞

　　關系代詞在定語從句中作主語時，定語從句中的謂語動詞應該與先行詞保持一致。

　　e.g. Anyone who wants to have a holiday puts up your hand.

　　Those who want to have a holiday put up your hand.

　　This is one of the students who have passed the exam.

　　This is the only one of the students who has passed the exam.

　　9.區分定語從句和其他句型

　　①區別于簡單句和并列句

　　most of whom are boys. (定語從句)

　　There are 70students in our class,and most of them are boys.（并列句）

　　Most of them are boys.（簡單句）

　　②區別于強調句型

　　It is in the factory that he works. (強調句型)

　　It is the factory where he works.（定語從句）

　　It is in the classroom (where we have classes) that the meeting will be held.

　　(定語從句修飾先行詞the classroom)

　　(強調句型，強調部分為介詞短句in the classroom)

　　③區別于同位語從句

　　that she had passed the exam（同位語從句：對名詞解釋說明）

　　The news excited us.

　　that he told us（定語從句：對名詞修飾限定）

　　④區別于狀語從句

　　Do you know the time when the class is over? (定語從句，有先行詞)

　　Let’s play games when the class is over.（時間狀語從句，無先行詞）

　　Put the book where it belongs. (地點狀語從句，無先行詞)

　　10.定語從句中關系詞的省略

　　定語從句中，作賓語的關系代詞可以省略，介詞之后的關系代詞不可省略。

　　This is the house which he lives in. (√)

　　This is the house he lives in. (√)

　　This is the house in which he lives. (√)

　　This is the house in he lives. (×)

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