8、before long 不久以后，很快 long ago/before 很久以前

It won't be...before... 用不了多长时间就会......(before从句用一般现在时)

It will be...before... 得过多长时间才......(before从句用一般现在时)

It wasn't...before... 没过多长时间就......(before从句用一般过去时)

It was...before... 过了多长时间才......(before从句用一般过去时)

(1)我们不久就意识到丹走了。①Before long (=Soon / /By and by) we realized Dan had left.

　　②It wasn't long before we realized Dan had left.

(2)It won't be long before we take the final exam.That is to say，we'll take the exam ________.

　A．long ago B．long before C．more or less D．before long

IV、重点句型: have sb./sth. doing sth. 使某人做......，使某物正处于......

　与can't，won't连用，且主语为第一人称时，表示"不容许，不许可"。

　have sb.do sth.叫某人做某事 have＋宾语＋to do ( have的意思是"有")

 1叫人做某事

　have sth.done 2遭遇某种(不幸的)事情

 3表示"把......做完"，主语也可自己参加完成

(1)用所给动词的适当形式填空

　① The Smiths had everything in their house (steal)．

　② They had the machine (run) the whole night.

　③ We will have the gardener (plant) more flowers and trees.

④ I have a lot to (complete) in the coming weekend，so I can't spare any time to have a rest.

⑤I can't have you (speak) to your mother in a rude manner.You must apologize to her immediately.

(2)-Did Peter fix the computer himself?

　SS-He ________，because he doesn't know much about computers.

A．has it fixed B．had fixed it C．had it fixed D．fixed it

V、单元语法：情态动词(2)

用适当的情态动词填空:

(1) You ought to have helped him with his English， you?

(2) - we start early? -Let's not start too early.