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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