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He has just come back. 他刚刚回来。

They have just finished the work. 他们刚刚完成那项工作。

4)for 和 since

for 后面跟一段时间，since后面跟的是时间点，这个时间点可能是单词、短语或一般过去时的句子。带有for或since短语的句子，谓语动词要用延续性动词。

He has been here for three days.

He has been here since yesterday.

He has been here since two days ago / last Monday.

He has been here since his wife died.

I have ever been to the Summer Palace。(我曾去过颐和园)

I have never had a car.(我从未有过汽车。)