1.不定式的三种时态
2.一般式
（1）表示将来即表示发生在谓语动作之后的动作。
We decided to leave early.我们决定早点动身。
We expect him to come in time.我们希望他能及时来。
（2）表示与谓语动作同时发生的动作。
I find him to be a cheat.我发现他是个骗子。
He is said to be very rich.据说他非常富有。
3.完成式
（1）表示发生在谓语动作之前的动作。
I hate to have quarreled with her.我后悔和她吵架了。
It’s said to have been built in the Ming dynasty.据说它是明朝修建的。
（2）表示过去未曾实现的想法，愿望或计划。
I should like to have come earlier.我本想早点来的。
We were to have been married last year.我们本来打算去年结婚的。
I wished to have bought a car，but I had no money.我希望买辆车，但我（当时）没有钱。
I intended to have come.我本打算来的。（但没来）
4.进行式
（1）表示与谓语动词同时发生时的动作。
He seems to be reading the book.他好像在读那本书。
He is believed to be studying abroad.人们说他在国外学习。
Don’t pretend to be working hard.不要假装努力工作。
I discovered him to be eating in the room.我发现他在房间里吃东西。
（2）表示将来的动作。
He was happy to be coming home.就要回家了他感到高兴。
The old man seems to be dying.这老人似乎要死了。