It was not until I began to work that I realized how much time I had wasted.

⑧      as soon as引导的时间状语从句

as soon as引导的时间状语从句，意为“一…就…”，表示从句的动作一发生，主句的动作马上就发生。

As soon as I heard the news, he jumped with joy.

⑨      once引导的时间状语从句

once引导的时间状语从句, 意为“一旦…就”，暗含条件意味。

    Physics is easy to learn once you understand the rules.

⑩      其它连词引导的时间状语从句

a.       the moment, the minute, the instant, the time, the hour, the day, by the time, each time, every time, next time, any time, the first time等也可引导时间状语从句。

The moment he reached the country, he started his search.

I thought her nice and honest the first time I met her.

b.       immediately, instantly, directly等也可引导时间状语从句。

I’ll give you an answer immediately I’ve finished reading your file.

Directly you feel any pains, you must go to the doctor.

c.     no sooner…than…, hardly/scarcely/barely…when…引导表示时间的句子，意为“刚…就…”（还没来得及就…）。主句在前面，从句用一般过去时，主句用过去完成时。如果否定词置于句首，主句可用倒装结构。如：

No sooner had I begun to talk when he rang off.

Hardly had I told him my name when he stopped listening.

Ø         复习要点：

a)  注意时间状语从句中，一般要用现在时态代替将来时态。

b)  连词until的用法

c)  when可连接并列句，意思为“就在那时”。

eg. Jasmine was holidaying in a wildlife park when she was bitten by on the leg by a bear.

d)  while可连接并列句，意思为“而......”。

eg. The southerners eat rice while the northerners like noodles.

Ø         辨析：when, while, as的辨析

a.       when引导的从句可以用延续性的动词，也可用短暂性的动词，而while和as引导的从句只能用延续性的动词。

Sorry. I was out when you called me.

It began to rain while we were walking in the park.

b.       while和as引导的从句的谓语动词所表示的动作通常与主句谓语动词所表示的动作同时发生， 而when引导的从句谓语动词的动作发生在主句之前或之后，也可同时发生。

When/while/ as we are dancing, a stranger came in.

When I got to the station, the train had left.

When I had finished my homework, he took a short rest.

c.        强调主从句的动作同时进行，从句的时间概念淡化，主要表示主句动作发生的背景或条件，意为“随着”，这时只能用as.

As years go by, China is getting stronger and richer.

2）   原因状语从句

引导原因状语从句的常用连词有because, as, since, now that, in that, for the reason that, considering(that), if/ when等。原因状语从句可位于句首，也可置于句尾。

①      because引导的原因状语从句

表示的因果关系最强，回答why提问的问句，because引导的原因状语从句往往比主句显得更为重要。

I’m leaving because I’m fed up with the boss.

Because we have strong players, we won the game.

②      since引导的原因状语从句

表示已知的事实，不强调的原因，常译为“既然”，通常置于句首，since引导的从句是次要的，重点强调的是主句的内容。

Since Monday is Bob’s birthday, let’s give him a party.

③      as引导的原因状语从句

as与since的用法差不多，所引出的理由在说话人看来已经很明显，或已为听话人所熟悉而不需用because来强调。

As Monday is a national holiday, all government offices will be closed.

④      其它连词引导的原因状语从句

now that, seeing that, for the reason that, in that等也可引导时间状语从句