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現在完成時的用法

1. 表示過去發生的動作對現在所造成的影響或表示從過去某一時刻開始一直延續到現在的動作或狀態。如：

I have finished my work. 我的工作干完了。

Luckily, I have read the book before. 幸好我以前看過這本書。

I have almost finished the book. 這本書我幾乎已經看完了。

And because of that, we have come to see you. 因此我們就來找你了。

We have used both written and aural material. 我們使用了書面和聽的材料。

She has been away on a long trip. 她離家作長途旅行去了。

He has behaved very badly to you. 他待你很不好(from m.52ysedu.com)。

The storm has lasted for three hours. 暴雨已經持續了三個鐘頭了。

2. 經常與現在完成時連用的狀語或結構有 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. 我認識她很長時間了。

I've already posted your letters. 我已把你的信發掉了。

So far there has been no bad news. 到現在為止還沒有壞消息。

Since then, he has developed another bad habit. 自那以后，它養成了另一種環習慣。

注：現在完成時不與具體的過去時間狀語或 when 連用。