1.不及物动词+介词=及物动词词组，介词别忘掉！
She takes good care of the baby.
The baby is taken good care. of (by her)
You should speak to the old politely.
The old should be spoken to (by you) politely .
Sb be taken care of
sb be spoken to
Sth be talked about
Sb be laughed at
sb be operated on
be looked down on
2.在主动句中,使役动词、感官动词make, see, hear, watch, notice等
词后跟省略to的不定式，变被动语态时，必须还原 to .
I often see him come into the room．
He is often seen to come into the room.
The boss made the workers work all day.
The workers were made to work all day.
We saw him playing in the street.
He was seen playing in the street.
注意：see sb doing 变 sb be seen doing
hear sb doing 变 sb be heard doing
类似的还有find和keep sb. Doing
3.带双宾语句子的被动语态.
（指物的宾语叫直接宾语， 指人的宾语叫间接宾语）
My father gave me a bike as a birthday present.
A bike was given to me as a birthday present.
I was given a bike as a birthday present.
She bought me a pen yesterday.
I was bought a pen yesterday.
A pen was bought for me yesterday.
不用被动语态的4种情况
1.连系动词（Link.v.)不用被动语态。
如:5个感官动词：feel, sound, smell, taste, look,
5个变得：be, go(bad), get, turn, become
2个保持:keep , stay
1个似乎:seem
2.不及物动词不用被动语态
2(发生) 2（出故障）2（come~~）
2对反义词
rise /fall appear / disappear
cost die arrive
Where __ did_ _ the football match _ take _(take) place Last month?
Over 400 people _ _die_ (die) in the sinking(下沉)of Changjiang Ship.
3:There be 句型没有被动语态
4：主句中的宾语是反身代词，没有被动语态
eg:She taught herself English (无被动语态)
有些动词既可以及物又可不及物 sell, write ,wash, grow等，
当他们与well, easily，fast等副词连用表示主语的性质时只能用主动。