《Section B》集体备课PPT课件下载-桂林市优质课

have

been

has gone

go went gone

be was been

现在完成时

意义:

1.表示过去发生或已经完成的某个动作对现在造成的影响或结果。

例: We have cleaned the classroom.

I have had breakfast.

2. 表示过去开始发生的事,一直持续到现在,且仍然在进行.由for 和 since引导时间状语.

例: (1) I have lived here for 3 years.

(2) Mr. Green has worked in China since five years ago.

完成

since+一段时间+ago

since+一般过去时的从句

现在完成时的句型构成:

have /has + 过去分词

主语第三人称单数－has

常见的暗示词:

(1) just, already, yet, ever, never, before, for +时间, since, so far, in the past+时间， by 等.

(2)for+时间段或since+过去时间点或过去时从句连用。

（3） 与once,twice,three times,several times(几次）等表示重复次数的词语连用。

三个词组的区别：

have/has been to

have/has gone to

have/has been in

曾经去过某地

去了某地，还没回来

去了某地，留在某地