a、be+现在分词构成进行时态。如:
He is listening to the radio.
他在听无线电广播。
What were you doing this time yesterday afternoon?
昨天下午这个时候你在干什么?
b、be+过去分词构成被动时态。
He is invited to the party.
他得到邀请参加这个聚会。
The letter was received this morning.
这信是今天上午收到的。
c、be+动词不定式表示计划好了的将来动作。如:
The meeting is to take place on Monday.
会议将在星期一举行。
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