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必修3《Grammar》集体备课PPT课件优质课下载
3Sandstorms in Asia apper to have increased in recent years.
Our tasks（学习目标）
1 Learn the structure of infinitive.
2 Grasp the different forms of infinitive
3 Aim to use infinitive correctly.
4 Learn to cooperate with others.
读一读
1 To learn English is difficult.
2 I have nothing to say.
3 My father decided to give me a present.
4 To see is to believe.
5 I find it easy to study English.
6 He went home to get money.
动词不定式具有名词、形词副词的特征。因此在句中可以主语、表语、宾语、补足语语
状语。
学一学
1.作主语
(1)把不定式置于句首
e.g.To say is one thing;to do is another.
(2)用it作形式主语，把真正的主语不定式
置于句后 It’s important to do it right away.
动词不定式作主语时句子有以下两种:
常用句式有：
① It＋be＋名词＋to do
It‘s our duty to take good care of the old.