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必修4《Lesson 3 Your Money》公开课PPT课件优质课下载
the infinitive “to do ”
Objectives
By the end of this lesson, you will be able to:
summarize the form and basic usage of the infinitives;
use the infinitives in a free talk.
They invite us to go there this summer. It is a great honor to be invited.
The forms of the infinitive
Simple form(一般式)：
不定式做动作与谓语动作（几乎）同时发 生或发生在其之后。
to do
to be done
They seemed to be talking about something secret when I came in.
The forms of the infinitive
Continuous form (进行式)：
不定式动作与谓语动作同时发生并且正在进行。
to be doing
You seemed to have read the novel written by Mr. Smith. I’m pleased to have been given this chance.
the forms of the infinitive
Perfect form(完成式)：
不定式动作发生在谓语动作之前。
to have done
to have been done
Do you believe we can fly like a bird?
不定式在句中的作用
How will you believe we can fly like a bird?