Section Ⅳ　Grammar & Writing

　　动词不定式

　　阅读下列句子并体会黑体部分的用法

　　1．Experts hope to learn more about the movement of thunderstorms.

　　2．There was nothing to be done.

　　3．The storms sometimes continue all day and traffic moves very slowly because the thick dust makes it difficult to see.

　　4．When a sandstorm arrives in the city, weather experts advise people not to go out.

　　5．It is difficult to breathe and the dust makes me ill.

　　6．To prevent it coming nearer, the government is planting trees.

　　7．My job is to teach English at this school.

　　8．I can do nothing but wait at home.

　　9．She has no choice but to give in.

　　一、动词不定式

　　1．动词不定式的时态和语态

　　语态

时态　 主动 被动 一般式 to do to be done 进行式 to be doing / 完成式 to have

done to have been done 　　(1)不定式的一般式：表示不定式的动作与谓语动词同时(几乎同时)发生或在谓语动词之后发生。

He asked me to help him with the task.