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 Iread first.
Will you beat home at seven this evening？
2）begoingto+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 astorm.
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 there port next Saturday.
4）beabout to+不定式，意为马上做某事。
He is about to leave for Beijing.
注意：beaboutto不能与tomorrow，nextweek等表示明确将来时的时间状语连用。