was加过去分词是什么时态

使用被动语态应注意：

1、不及物动词无被动语态。

What will happen in 100 years.

The dinosaurs disappeared about 65 million years ago.

2、有些动词用主动形式表示被动意义。

This pen writes well.

This new book sells well.

3、感官动词或使役动词使用省略to的`动词不定式，主动语态中不带to ，但变为被动语态时，须加上to 。

例：make somebody do something→somebody+ be +made to do something

see somebody do something→somebody +be +seen to do something

A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.

The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.

4、如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。

He gave me a book.→A book was given to me by him.

He showed me a ticket.→A ticket was shown to me by him.

My father bought me a new bike. →A new bike was bought for me by my father.

5、一些动词短语用于被动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。

We can't laugh him. →He can't be laugh by us.

He listens to the radio every day. →The radio is listened to by him every day.

The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.