一般将来时
1)shall用于第一人称，常被will 所代替。
will 在陈述句中用于各人称，在争求意见时常用于第二人称。
Which paragraph shall I read first.
Will you be at home at seven this evening?
2)be going to +不定式，表示将来。
a. 主语的意图，即将做某事。
What are you going to do tomorrow?
b. 计划，安排要发生的事。
The play is going to be produced next month.
c. 有迹象要发生的事
Look at the dark clouds, there is going to be a storm.
3) be +不定式表将来，按计划或正式安排将发生的事。
We are to discuss the report next Saturday.
4)be about to +不定式，意为马上做某事。
He is about to leave for Beijing.
注意：be about to 不能与tomorrow, next week 等表示明确将来时的时间状语连用。
be to和be going to
be to 表示客观安排或受人指示而做某事。
be going to 表示主观的打算或计划。
I am to play football tomorrow afternoon.(客观安排)
I'm going to play football tomorrow afternoon. (主观安排)
