2. 时间状语从句：after

时间状语从句由下列连词引导：After, as, before, once, since, till, until, when, whenever, while, as soon as

Let's wait till the rain stops. 咱们等到雨停再说吧。

Once the train is moving, there's no way to stop it.

火车一旦开动就没办法让它停下来。

They were scolded whenever they were late for school. 每次他们上学迟到都挨骂。

3. 时间状语从句：the moment

有一些表示时间的名词短语也可用来引导时间状语从句：The minute, the moment, every time, the first time

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

他一到达这个国家，就开始他的探寻工作。

Every time I saw the straw hat, it reminded me of the tour I made years before.

每当我看到那顶草帽，它就使我想起几年前的那次旅游。

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

我第一次见到她就觉得她诚实而友善。

4. 时间状语从句：directly

有一些表示时间的副词也可用来引导时间状语从句：

Directly the master came in, everyone was quiet. 校长一进来， 大家就安静下来。

The young lady rushed into the room immediately she heard the noise.

那位年轻女士一听到响声就冲进房间。