一般现在时被动语态句型：
Trees are planted every year.
Classroom is cleaned every day.
Football match is held ever year.
一般将来时的被动。
The match will be held in ten minutes.
The clothes will be washed this afternoon.
The car will be cleaned soon.
The building will be destoried.
一般过去时的被动。
He was made to do homework all the morning.
The rocket was lanched into space last month.
He was seen to play football yesterday.
