我一直等到9点钟。(wait为延续性动作)

I didn't go to bed until/till my father came back.

我直到父亲回来才上床睡觉。(go to bed为非延续性动作)

注意　(1)在not...until...结构中，not until位于句首时主句用部分倒装。

Not until recently did I know what he had done.

直到最近我才知道他所做的事。

(2)在强调句中，强调until引导的时间状语时，常把not提前，构成It isn't/wasn't until...that...。

It wasn't until 11 o'clock that he returned home.

直到11点他才回家。

4．as soon as...，hardly...when...，no sooner...than...一......就......

若把表示否定含义的副词hardly/no sooner等放在句首，它们所在的主句要部分倒装，且主句要用过去完成时态。

Hardly had he arrived when it began to rain.

＝No sooner had he arrived than it began to rain.

他刚到天就开始下雨了。

5．表示"一......就......"的一些副词有：immediately，instantly，directly等。

Immediately the bell rang，the boys rushed out.

铃一响，男孩子们就冲出去了。

6．一些表示时间的名词词组，如the moment，each time，every time，the first time，the last time，next time，the minute，the instant等也可以用来引导时间状语从句，起连词的作用。

Every time he came，he would bring me good news.

他每一次来，都会给我带来好消息。

The first time I went to Mount Tai，I was very happy.

第一次去泰山，我非常高兴。

二、条件状语从句

　　条件状语从句是由if，once，as/so long as，unless，on condition that，in case等引导的。在条件状语从句中，通常用一般现在时代替一般将来时，一般过去时代替过去将来时，现在完成时代替将来完成时。

1．if和unless是最常用的条件状语从句的连接词，unless在意义上等于if...not...，并且语气较强。if可用于虚拟条件句。

You will improve your oral English if you keep on practising.

如果你坚持练习的话，你将会提高你的英语口语。

Unless he studies hard，he will never pass the examination.