初中英语语法复习—现在完成时课件

现在完成时课件

现在完成时课件下载

课件部分内容如下:

概念1.过去某一时间点发生的动作对现在产生影响。

概念2. 过去某一时间点发生的动作持续 到现在 或还将持续下去。

2) since +过去点时间 since +一段时间+ago since +从句(从句用一般过去式) e.g. He has worked here since 1990. She has taught in this school since two years ago. We have known each other since we met.

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