[高一英语]Grammar-Infinitive_M4B3.ppt

What are the functions of infinitive? (a).To have been caught in a sandstorm was a terrible experience. (b). To be cycling in a sandstorm is frightening. (c). It’s difficult to breath and the dust makes me ill. (d) To see is to believe. (e) It is right to give up smoking. (a). a mass campaign has been started to help solve it. (b). Sandstorm in China appear to have increased in recent years… (c). …because the thick dust makes it difficult to see. (d). …So if you want to go out, you’d better wear a mask. (e). …and plans to continue planting for the next five years. (f) I find it interesting to study English. (a)…weather experts advise people not to go out. (a).There was nothing to be done. (b). Scientists have tried many ways to solve this problem. (c) I have some books for you to read. “to do” here is used as the  adverbial of result(结果状语) (a).The wind is strong enough to move sand dunes. (a). To prevent it coming nearer, the government is planting trees. 动词不定式的省略 一、不带 to 的不定式 1.hear, see, watch, make, let, have(=make), feel, notice, observe, look at, listen to等动词（短语）后，动词不定式作宾语补足语时，to通常被省略。 help后的 可以省去，也可以保留。 I saw her enter the cinema. We must have someone repair the computer. He helps the little girl (to)finish her homework every day. 2,疑问词why引导的省略句中的不定式一般省去to. Why spend such a lot of money? Why not wait for a couple of days? 3. would rather…than, had better等之后，通常接不带to的不定式。 I would rather go than stay. You had better hurry up if you want to catch the 1:15 train. 4. cannot but,cannot choose but,cannot help but等之后的不定式一般不带to. I cannot but admire his courage. He could not choose but obey. She couldn’t help but wonder what he was thinking. 5.在介词but之前如有动词do或do的某种形式，其后的不定式省去to；否则，其后的不定式一般要带to. We have nothing to do now but wait. John never does anything but talk. He wanted nothing but to stay there. 6.为了避免重复而省去to. I’m really puzzled what to think or