【#文档大全网# 导语】以下是®文档大全网的小编为您整理的《till 和 until的用法》，欢迎阅读！
till/until
1.在肯定句中，主句中谓语动词必须使用延续性动词，该动作延续到till/until 引出的时间停止。Eg:
He stayed/sat up till/until his son came back.
stayed/sat up 这个动作延续到his son came back这个时间停止。 在否定句中，主句中的谓语动词必须使用非延续性动词，该动作不到till/until 引出的时间不发生，直到till/until 引出的时间才发生。Eg: He didn’t go to bed till/until his son came back.
go to bed 这个动作不到his son came back 不发生，直到his son came back才发生。 2. 倒装
否定副词位于句首引起句子的部分倒装。Eg: Not until his son came back did he go to bed. 3. 强调
在强调结构中，要求把not跟过去。Eg: He didn’t go to bed till/until his son came back.
It was not until /till his son came back that he went to bed.
4. till 引导的分句不能位于句首。 (in order to/ so as to的区别：so as to 不能位于句首)
Until his son came back he didn’t go to bed. 5. 主句是将来时，从句用一般时来替换将来时。Eg: He would stay/sit up until his son came back.
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2023-10-30
