1. 不定式作后置定语，与被修饰的名词或代词构成逻辑上的动宾关系，但又与该句主语（或另一名

词/代词）构成逻辑上的主谓关系时, 用主动表被动。

★ 注意：若句子的主语并非不定式的逻辑主语时，不定式则用被动式。

比较： I have a lot of letters to type . (我有很多信件要打印：I will type the letter)

I have a lot of letters to be typed. (意思为：I get sb. to type the letter)

2. 在"主语+表语（形容词）to do" 中，主语也是不定式的逻辑宾语, 即不定式动词和主语之间是动宾关系, 用主动表被动。

This question is easy to answer.

★ 注意：如果动词为不及物动词，则要注意介词的搭配。

John is difficult to deal with.

3. 在too ...to...; enough...to...结构中，不定式前面可加逻辑主语，所以应用主动形式表示被动意义。

The box is too heavy for me to carry.

即景活用：

1) The elegant lady had something ______________________(declare).

2) I' ll go to New York. Have you anything____________________(take) to your wife there?

3) I cannot go out now as I have a lot of clothes _______________(wash)

4) The armchair is comfortable _______________(sit)

达标检测

I. 用括号内单词的正确形式填空。

1. George returned after the war, only ____________(tell)that his wife had left him.

2. We are having a meeting in half an hour. The decision ___________(make) at the meeting will influence the future of our company.

3. We've had a good start, but next, more work needs _______(do) to achieve the final success.

4. I like getting up very early in summer. The morning air is so good _____________(breath).

5. Having a trip abroad is certainly good for the old couple, but it remains ___________(see)whether they will enjoy it.

6. Little Jim should love _________________(take)to the theatre this evening.

7. I have a lot of things _______________(do)this afternoon.