现在完成时的用法

现在完成时的用法

1. 表示过去发生的动作对现在所造成的影响或表示从过去某一时刻开始一直延续到现在的动作或状态。如：

I have finished my work. 我的工作干完了。

Luckily, I have read the book before. 幸好我以前看过这本书。

I have almost finished the book. 这本书我几乎已经看完了。

And because of that, we have come to see you. 因此我们就来找你了。

We have used both written and aural material. 我们使用了书面和听的材料。

She has been away on a long trip. 她离家作长途旅行去了。

He has behaved very badly to you. 他待你很不好。

The storm has lasted for three hours. 暴雨已经持续了三个钟头了。

2. 经常与现在完成时连用的状语或结构有 already, just, so far, in the last [past] few years, it is the first time that, for five years, since 1980 等。如：

I've known her for a long time. 我认识她很长时间了。

I've already posted your letters. 我已把你的信发掉了。

So far there has been no bad news. 到现在为止还没有坏消息。

Since then, he has developed another bad habit. 自那以后，它养成了另一种环习惯。

注：现在完成时不与具体的过去时间状语或 when 连用。