I have leraned English for three years.
Have you seen the film?
He hasn't finished his homework yet.
They have already cleaned the room.
这句话是现在完成时。完成时有好多种的。
现在完成时
是现在的过去。比如你的例子。
过去完成时
是过去的过去。例子：he
had
done
his
homework
before
i
left.
还有
将来完成时，是将来某一时间已经完成的动作。
例子：he will
have
done
his
homework
by
next
week.
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