am/is/are/going to + do和will/shall + do
1) shall用于第三人称单数，常被will 所代替,二者都可以缩写成'll。
will 在陈述句中用于各人称，在征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 +动词原形地点，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。
