I was about to leave when he came in.

10.将来完成时(will have done)从现在看来，到将来某时已经完成

的动作，常与by连用：

We will have finished our work by 8 o'clock tomorrow.

11.将来进行时(will be doing)：

This time next year you will be studying at college.

12.过去完成进行时(had been doing)：

He said that he had been painting the house all day.

13.将来完成进行时(will have been doing)：

By eight o'clock tomorrow we will have been working for ten

hours.和：How many English words have you learned?

(4)have been to a place/have gone to a place

He has been to Beijing twice.(主要强调He has come back.)

He has gone to Beijing.(主要强调He isn't here.)