472　see sb. do sth.和be seen to do sth.——用to还是不用to

1　在某些动词后，不定式作宾语补足语时不带to，只用动词原形，初中英语中应掌握的这类动词有：hear, see, let, make （要，让），feel, watch, find, listen to, look at, have （使，让）等。

I often hear her read English in the morning. 我常常听见她早晨读英语。

She made him try again. 她要他再试一次。

I will have you do it. 我将让你做那件事。

2　可以看出，上面例句中的谓语动词都是主动语态，后跟的不定式不带to 。但是，如果句中的谓语动词用的是被动语态，原来作宾语补足语的不定式前就要加to 。

She is often heard to read English in the morning. 她常被听见早晨读英语。（人们常听见她早晨读英语。 ）

He was made to try again. （正）他被让再试一次 。

He was made try again. （误）

他们听老师读那篇短文 。

They listened to the teacher read the passage. （正）

The teacher was listened to to read the passage. （正）

The teacher was listened to read the passage. （误）

He made them work all day. （正）他让他们整天干活 。

They were made to work all day. （正）

They were made work all day. （误）