It will be not long before he finishes his job.

④. It looks ( seems ) as if ...

该句型中it无意义， as if 引导一个状语从句。常译为，＂看起来好象．．．＂如果与事实不相符合，则用虚拟语气。

It looks as if he is ill.（真的病了）　

It looks as if he were ill. （没有生病）

It seemed as if he were dying

⑤. It doesn't matter whether ( if ) ...

该句型中whether(if) 引导的从句是真正主语，该句型常译为　"不论（是否）．．．没关系．．．。　

It doesn't matter if they are old.

⑥. It的一些习惯用法

That's it . 这就对了。

I can't help it. 我没有办法。

Forget it ！ 别提了，忘了它吧

It doesn't matter 没关系

It's hard to say 很难说

Step 3. Exercises

⑴．Doing exercises to consolidate the usage of it as formal subject

Complete the following sentences:

① 对于我们来说早起是非常重要的.

______________________ to get up early in the morning.