时间状语：典型的表时间的词与现在完成时连用

与for 、since、 already、 yet、 ever、 never、 recently、just、before、 so far、 by now、 …等连用.

注意: for+一段时间 since+过去的某一个时间点

I have lived in Nanning for ten years.

I have lived in Nanning since ten years ago/ 2002.

I haven’t eaten anything for ten hours.

I ha haven’t eaten anything since 6am.

already :用于肯定句, 可放在助动词之后、过去分词之前，也可放在句末.

I have already finished my homework.

yet: 用在疑问句中意为”已经”, 用在否定句中表示”还”, 常放在句末.

Have you finished your homework yet?

I haven’t finished my homework yet.

ever: 曾经 用于疑问句中：

Have you ever been to Beijing?

Have you ever been to Shanghai ?

你去过上海吗?

never:未曾 从未

I have never traveled by plane before.

我以前从来没有乘飞机旅行过.

recently：最近 用于肯定 否定 疑问句中

I have been busy recently.

We have not seen Tom recently.

Have they been here recently.