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人教2003课标版《Learning about Language》优质课PPT课件下载
two hours ago
It has been raining for 2 hours.
now
He started running.
He is out of breath.
an hour ago
He has been running.
5 minutes ago
now
He knocked at the door.
He knocks at the door.
He has been knocking at the door.
has/have been -doing
present perfect continuos
现在完成进行时
How?
started
still
go on
past
now
future
two hours ago
raining
It has been raining.