He has just come back. 他剛剛回來。

They have just finished the work. 他們剛剛完成那項工作。

4)for 和 since

for 后面跟一段時間，since后面跟的是時間點，這個時間點可能是單詞、短語或一般過去時的句子。帶有for或since短語的句子，謂語動詞要用延續(xù)性動詞。

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。(我曾去過頤和園)

I have never had a car.(我從未有過汽車。)

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