动作，不与具体时间连用。

You'd better fasten your seat belt. The plane is about to take off.你最好系好安全带，飞机马上要起飞了。

(2)be about to... when...是固定句式，意为"正要做... .时......=be on the point of doing ...when...= be going to do... when...

She was about to leave when some guests came.

她刚要离开，这时来了一些客人。

[即时演练6] 补全句子

①I ________________________ in when he rushed out.

我刚要进来，他突然闯出来。

②I _______________________________ the telephone rang. 我正要锁门，这时电话响了。

5.一般现在时表将来

一般现在时表示将来，表示按照日程表或时刻表的安排要发生的事，如火车(汽车)出发、船只离岸、飞机起飞等，或用于时间和条件状语从句中。

The bus leaves at 9:00 pm.汽车将于晚上9点离开。

[即时演练7]用所给词的适当形式填空

①9月1日新学期将开始。

New term _____________ (begin) on September lst.

②我一到那儿就给你写信。

I'll write to you as soon as I ________ (get) there.

主将从现

主将从现：是指在条件状语从句和时间状语从句中，主句是一般将来时，从句用一般现在时

（标志词）

if

as long as

unless

when + 从 句， 主 句.

while （一般现在时） （一般将来时）

as soon as

until

before

1.主将从现

主句是一般将来时，从句用一般现在时。

If you ask him, he will help you.

I'll go there tomorrow unless it rains.

When I grow up, I'll be a doctor.

If he goes to the party, you will be happy.

2.主祈从现

主句是祈使句，从句用一般现在时。

Don't laugh at me when I make a mistake.

Put it in your diary before you forget. 用记事本记下免得忘了。

3.主情从现

主句中含有情态动词，从句用一般现在时。

You should be quiet when you are in the reading room.

A baby deer can stand as soon as it's born. 小鹿一生下来就能站着。

You can get a better job if you speak a foreign language.

要是你会说一种外语，那你就会找到更好的工作。

填空

1. If I come, I __________ ( see ) you.

2. If it is fine, we__________( go ) for a walk.

3. If it rains, they ____________ ( stay) at home.

4. You will spoil it if you ________ ( not be ) careful.

6. Will you help me if I ________ ( need ) you.

7. They will get wet if it ________ ( rain ).

9. If you eat too much, you __________( get ) ill.

翻译

1.即使下雨我们也去博物馆。

_______________________________________________

2.如有必要，我6点钟来。

_______________________________________________

3.只要你求他，他会帮你的。

_______________________________________________

4.如果你能来，我们将非常高兴。

_______________________________________________

5. 她一到，请你就把消息告诉她。（祈使句）

_______________________________________________

课后强化训练

单句语法填空

1. The plane takes (take) off at 10:10. That is, it _________ (leave) in ten minutes.

2. As soon as he_________ (come) back, I will tell you.

3. The students in Grade One took eight subjects this term. They _____________ (take) six subjects next term.

4.一You are wanted on the phone, Ann！

--OK, I _________ (come).

5. Usually the new term _________ (start) on August 29th.

6. Tom, Mr. White _________ (leave). Will you please show him out?

7.-Did you tell Julia about the result?

-Oh，no, I forgot. I _________ (call) her now.