现在完成时也用于长久的行为和状态其始于过去而持续到最近。

The present perfect is also used for long actions and situations which started in the past and went on until very recently.

youdao

现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。

We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.

youdao

现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。

We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.

youdao