He has just come back. 他剛剛回來(lái)。

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

4)for 和 since

for 后面跟一段時(shí)間，since后面跟的是時(shí)間點(diǎn)，這個(gè)時(shí)間點(diǎn)可能是單詞、短語(yǔ)或一般過(guò)去時(shí)的句子。帶有for或since短語(yǔ)的句子，謂語(yǔ)動(dòng)詞要用延續(xù)性動(dòng)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(guò)頤和園)

I have never had a car.(我從未有過(guò)汽車(chē)。)

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