牛津 8B Unit3典型题例解析

牛津8B Unit3典型题例解析
原题：When your homework ______, you may go shopping.
A. was done
B. will be done
C. is done
D. are done
解答；答案“C”。

When引导的时间状语从句，应用一般现在时表示将来。

句中主语是homework（单数），因此用被动语态is done.
被动语态Ｂ
一般过去时的被动语态跟一般现在时的被动语态结构相同，只是助动词be变成相应过去式was/were.
例如：These pencils were made in Shanghai last year.
这些铅笔是去年在上海造的。

------When was the computer built?
------It was built in 1997.
这台电脑什么时候造的？１９９７年。

The room was cleaned by Tom yesterday.
这房间是汤姆昨天打扫的。

有些动词必须用主动语态表示被动意义：如write, read, wash, sell等用作不及物时，接副词作状语。

例如：This kind of cloth washes easily. 这种布容易清洗。

Your new pen writes well. 你的新钢笔好写。

典型题例：
答案选：“Ｂ”。

经过了“a good operation”后，从常规看那老人不会有危险的，应该是“was saved”被挽救了；再则dangerous实指人、物、事态等可能引起的危险，而对人本身“处于危险中”也该说“be in danger”；选项C应改safely为safe 才可以。

疑难题导析：
１.He saw her come out of the library. ( 改为被动语态) 误：She was seen come out of the library.
正：She was seen to come out of the library.
解析：凡主动语态的句子中有省去不定式符号to 的不定
式作宾语补足语，改为被动语态时，必须将不定式符号to 加上，此时的不定式事实上是主语的补足语了，再则也不
能在谓语动词后紧跟一个动词原形。

２.Many more houses ________ for teachers in this city since 1998.
A. were building
B. are being built
C. were
built D. have been built
答案选“D”。

首先肯定“house”与“build”之间是被动关
系，再看由since 引起的状语，主句动词要用完成式。

３.Jim with his parents ________ many places of interest in China.
A. is visited
B. have visited
C. has visited
D. are visited
答案选“C”。

本题主要弄清主语是谁。

原句含义：“与父
母一起，吉姆去过中国的好多名胜。

”本句中主语Jim 不受
with 结构（作状语）影响，谓语用单数；主谓之间没有被
动关系，不选“A”。

４.The picture ______ by the student just now.
A, took down B. taken down C. was taken down D. was down taken
答案选“C”。

本题主要考查一般过去时的被动语态，带有介
词或副词的动词短语，变为被动语态时，介词或副词不能
丢弃。

５.Tom ______ a birthday present every year.
A. is often given
B. often is given
C. is given
by D. is always given
答案选“D”。

注意：often, always, never等副词，必须放在助动词与行为动词之间。

句中时间状语用了every year，说明是每年的事，应选用always.
６.同义句转换：The students clean the classroom every
day.
The classroom _____ ______ _______ the students every day.
答案是Is cleaned by. 被动语态的谓语动词结构“be + 及物动词的过去分词”。