动词不定式主动表被动用法归纳

动词不定式有两种被动式, 即一般式和完成式, 例如do的被动式有to be done, to have been done。

只有及物动词和相当于及物动词的短语才有不定式的被动式。

一般说来, 当不定式的逻辑主语是不定式动作的承受者时, 该不定式要用被动式。

例如:
He asked to be sent to work in that factory. 他要求派他去那个工厂工作。

These books are not allowed to be taken out of the room. 这些书不许带出室外。

但在某些情况下, 不定式虽然表示被动意思, 用的却是主动形式。

常见的有下列几种情况:
一、在某些固定句型中, 动词不定式作定语, 用主动形式表被动意义。

1）have（give, show）sth. to do
在这种句型中的不定式与前边的名词有动宾关系, 又和句中另一名词或代词构成主谓关系。

例如: I have a lot of things to do this afternoon. to do与things是动宾关系, 与I是主谓关系。

否则, 在表示被动意义时, 仍需要被动式。

试比较:
Have you anything to do this afternoon? 今天下午你有事要做吗?
（to do是由you发出的）
Have you anything to be taken to your parents? 你有要带给你父母的东西吗? （谁带不得而知）再如:
Please get me something to read. 请给我弄点读的材料。

He'll show you the right path to take. 他会给你指出要走的正确的路。

2）It（This, That）＋be＋a／an＋adj. ＋n. ＋to do
在这种句型中, 不定式与前面的名词有动宾关系。

动词不定式可改为动词不定式复合结构。

例如: This is a difficult question to answer. 这是个难答的问题。

question与to answer为动宾关系。

to answer可改为for me to answer。

再如:
It is an easy sentence to translate. 这个句子很容易翻译。

3）There ＋be ＋n. ＋to do
在此句型中, 用来修饰主语的不定式, 可用主动式, 也可用被动式, 只是侧重点不同。

用主动式作定语, 重点在人, 用被动式作定语, 重点在物。

例如:
没有时间可以耽误。

可译成:
There is no time to lose（to be lost）. 用to lose可看成for us to lose; 用to be lost, 谁lost time 不明确。

但下述两句用主动不定式与被动不定式意义不同:
a. There is nothing to do now. （＝We have nothing to do now. ）现在没事干。

b. There is nothing to be done. （＝We can do nothing now. ）现在没办法了。

a. There is nothing to see. （nothing worth seeing）没有东西值得看。

b. There is nothing to be seen. （nothing there at all）看不见什么东西。

二、在某些“形容词＋不定式”的结构中, 不定式有被动意义, 与句子主语构成动宾关系。

其句型有:
1）n. ＋be＋adj. ＋to do
The question was very difficult to answer. 这问题很难回答。

The job is very easy to do. 这工作很容易做。

2）n. ＋be＋too＋adj. ＋to do
The thing is too small to see. 这东西太小看不见。

I was too excited to say a word. 我激动得连一句话也说不出。

3）n. ＋be ＋adj. ＋enough to do
The box is light enough to carry. 这盒子轻得可带走。

The book is cheap enough to buy. 这本书很便宜可以买。

但下列两句可用不定式的主动式, 也可用被动式:
This plant is fit to eat ／to be eaten. 这种植物可以食用。

The cake is ready to eat ／to be eaten. 这块饼可以吃了。

三、某些动词, 如to let, to blame （责备）, to seek（寻找）用主动式表被动意义。

例如:
The house is to let. 这房子要出租。

Who is to blame for it? 这得怪谁?
The reason is not far to seek. 这理由不难找到。

练习: 选择填空。

1. The chair looks rather hard, but in fact it is very comfortable to __________.
a. sit
b. sit on
c. be sat
d. be sat on
2. I'm hungry. Get me something __________.
a. eat
b. to eat
c. to be eat
d. for eating
3. It is difficult for a foreigner __________ Chinese.
a. write
b. to write
c. to be written
d. written
4. I have no more letters __________, thank you.
a. to type
b. typing
c. to be typed
d. typed
5. The car is rather difficult __________.
a. to repair
b. to be repaired
c. repairing
d. being repaired
6. He was nowhere __________.
a. to see
b. to be seen
c. seeing
d. seen
7. She had no money __________ a birthday present for their children.
a. to buy
b. to be bought
c. bought
d. buying
8. We waited for the work __________.
a. done
b. being done
c. to do
d. to be done
答案:
1—5 bbbca 6—8 bad。