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.