David won’t go to bed until / till his wife returns.

　　Leo didn’t come until he had gone over his lesson.

　　not until位于句首时，主句须用倒装语序。如：

　　Not until I began to work did I realize how much time I had wasted.

　　not until结构可用于强调句中。如：

　　It was not until she came to see us that we knew her mother was ill in bed. 3. when

　　when引导时间状语从句时，从句的动作既可与主句的动作同时发生，也可先后发生。如：

　　When we were at school, we went to the library every day.

　　When the meal was finished, Rachel washed up.

　　when可以引导条件状语从句，意为“如果”。如：

　　How can we explain it to you when you won’t listen?

　　when可以作并列连词，意为“正在那时，突然”，此时所引导的从句只能放在主句之后。如：

　　We were swimming in the lake when suddenly the storm started.

　　4. as

　　as可以引导时间状语从句，其动作是延续性的，表示“当……时，随着”。

　　The atmosphere gets thinner and thinner as the height increases.

　　as可以引导原因状语从句，一般放在句首，表示十分明显的原因。如：

　　As it is raining, we shall not go camping.

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