副詞子句就是一個副詞加上一個句子，例如When I wake up, I wash my face first。這個句子中的When I wake up就是副詞子句，也就是S V O P A的句子結構下，A這個副詞能夠連接另外一個句子。也就是S V O P (A+SVOPA)。
本單元僅以時間副詞子句為例子說明，可在39單元做更深入了解。
表達時間關係的副詞子句
by the time: 表達一事件發生時，另一事件已經發生。
(a) By the time he arrived, we had already left.
(b) By the time he comes, we will have already left.
since/ever since: 表達自從或從那時到現在。
(a) I haven’t seen him since he left this morning.
= I haven’t seen him ever since he left this morning. (語氣較強烈)
until/till: 表達某事持續發生直到另一事件發生。
(a) We stayed there until we finished our work.
as soon as/once: 表達"一旦"某事發生，另一事件即刻發生。
(a) As soon as it stops raining, we will leave.
= We will leave once it stops raining.
as long as/so long as: 表達"只要"一條件成立，另一事件或條件也成立或發生。
(a) I’ll never talk with him again as long as I live.
= So long as I live, I’ll never talk with him again.
whenever/every time: 表達”每當"一事件發生時，則另一事件也跟著發生。
(a) Whenever she sees me, she says hello.
= She says hello every time she sees me.
the first time/the last time/the next time: 表達第一次、下一次、或最後一次某事件發生時，另一事件也會發生。
(a) The first time (that) I went to New York, I went to a concert.
(b) I saw two plays the last time I went to New York.
(c) The next time I go to New York, I’m going to see a ballet.
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