句型29.

主语＋肯定谓语＋until＋从句.请比较：主语＋否定谓语＋until+从句.如：

I worked until he came back.我一直工作到他回来。

I didn't worked until he came back.他回来我才开始工作。

句型30.

As soon as / Immediately / Directly / Instantly / The moment / The instant / The minute +从句，＋主句. 如：

My father went out immediately I got home.我一到家，我父亲就出去了。


句型31.

No sooner +had + 主语＋done…than +主语＋did. 请比较： 主语＋had + no sooner +done…than +主语＋did. 如：

No sooner had I got to Beijing than I called you.我一到北京就给你打电话了。请比较：I had no sooner got to Beijing than I called you.


句型32.

Hardly/Scarcely/ Rarely +had +主语＋done…when / before + 主语＋did.请比较：主语＋had+hardly/Scarcely/ Rarely + done…when / before +主语＋did.

Hardly had she had supper when she went out. 她一吃完晚饭就出去了。请比较： She had hardly had supper when she went out.