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(zhēng)求意見(jiàn)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(lái)。

a. 主語(yǔ)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(lái)，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(lái)時(shí)的時(shí)間狀語(yǔ)連用。