1) shall用于第一人稱，常被will 所代替。
will 在陳述句中用于各人稱，在爭求意見時(shí)常用于第二人稱。
Which paragraph shall I read first.
Will you be at home at seven this evening?
2) be going to +不定式，表示將來。
a. 主語的意圖，即將做某事。
What are you going to do tomorrow?
b. 計(jì)劃，安排要發(fā)生的事。
The play is going to be produced next month。
c. 有跡象要發(fā)生的事
Look at the dark clouds, there is going to be a storm.
3) be +不定式表將來，按計(jì)劃或正式安排將發(fā)生的事。
We are to discuss the report next Saturday.
4) be about to +不定式，意為馬上做某事。
He is about to leave for Beijing.
注意：be about to 不能與tomorrow, next week 等表示明確將來時(shí)的時(shí)間狀語連用。