高一下册《Appendix III Grammar glossary》优秀ppt课件

高一下册《Appendix III Grammar glossary》优秀ppt课件

This incident has received great interest due to reports of …

I haven’t seen Justin since.

Go over the news story, Boy missing, police puzzled, and find the sentences using the present perfect tense.

4. It’s happened to me!

5. When asked …, who has taken charge of the case, told …

6. So, while we have not dismissed the idea, we are looking into other possibilities as well.

现在完成时

现在完成时用来表示之前已发生或完成的动作或状态，其结果的确和现在有联系。动作或状态发生在过去但它的影响现在还存在；也可表示持续到现在的动作或状态。其构成：

have (has) +过去分词

John has broken his left leg.

We have studied English for about five years.

They have lived in the south since their daughter was born.

I have read your article three times. It’s well written.

The student has finished her homework already.

Eric has gone back to his home town today.

More examples

现在完成时的用法：

1）表示过去发生或已经完成的某一动作对现在造成的影响或结果。通常与表示包括现在在内的时间副词just，already, before, yet, never, ever等状语连用。例如：

I have never heard of that before.

Have you ever ridden a horse?

She has already finished the work.

I’ve just lost my science book.

2）表示过去已经开始，持续到现在,也许还会持续下去的动作或状态。可以和表示从过去某一时刻延续到现在的一段时间的状语连用。 如：for和since，以及 so far, now, today, this week (month, year) 等。

I haven’t seen her these days.

She has learnt English for 3 years.