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少数短语动词通常只用被动语态：
①be taken in受骗，上当 ②be supposed to do something应该，被期望
③be intended for something(somebody) / to do something旨在，用于
The book is intended for beginners. We are supposed to meet at the gate at 7：00.
转化为系动词的感官动词 + 表语
Good medicine tastes bitter. This material feels very soft.
不及物动词和词组无被动语态： How long did the meeting last?
in case， whether， where， as soon as遵照“主将从现”原则， 主句用将来时态，从句用现在时态
Whether I win or lose， I will have a good time. I will write to you as soon as I get here.
表示心理活动和存在的动词一般不用进行时态： They love and respect each other.
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