We have bought a new computer.
→A new computer has been bought. (正确)
→A new computer have been bought. (错误)
My uncle gave me a present on my birthday.
→I was given a present on my birthday.
→A present was given to me yesterday.
3) 由动词 介词或副词构成的短语动词，要把它们作为整体看，即把它们看成一个及物动词，介词或副词不可拆开或漏掉。
The patient is being operated on.
The problem is solved. It needn't be talked about.
His request was turned down.
The sports meet will be put off because of the bad weather
We always keep the classroom clean.
→The classroom is always kept clean.
She told us to follow her instructions.
→We were told to follow her instructions.
注意：在see, watch, he