★注意：不定式的主动形式表示被动意义须具备两个前提条件：

(1) 常用形容词有：difficult, hard, easy, comfortable, pleasant, interesting, exciting等

(2) 不定式和句子的主语之间构成逻辑上的动宾关系；若不定式为不及物动词，其后应该加相应的介词

【练习】

1). I like getting up early in summer. The morning air is so good _________ . (breathe)

2). The question was hard_________ so most of them kept silent. (answer)

3). Many bad habits can be especially difficult ________ (cure).

4).This machine is very easy ______________ (operate).

5). She told me that the maths proble was hard ______________ (work out)

堂测堂练

I.单句语法填空

1.The government insisted that plans _______(make) to help those out of work.

政府坚决要制订计划帮助失业的人

2.My husband and I insisted that our children_______________ (be) old enough to make their beds.

　我和丈夫坚持认为我们的孩子已足够大可以自己铺床了．

3. -Have you seen the film Under the Hawthorn Tree?

- Of course, I have. It was in our village_______ it was made.

1. I'm afraid we'll have to work extra hours, for some problems are hard__________ (settle)．

II. 根据中文提示完成句子

1.Although the lady looks elegant, actually she __________________________________

尽管这位女士看上去很优雅，但实际上却很难与之相处.

2.The chair looks rather hard, but in fact it _________________________________________.

这把椅子看上去很硬，但事实上坐在上面很舒服

3.________________ help us understand science better and arouse our curiosity about scientific