once和if引导条件状语从句区别

如题所述

1. 时间状语从句
Once you are in America, you will see how developed the country is.
(原句语序正确,只需将"know"改为"see",以保持语义一致。)
2. 条件状语从句
Once his mind is made up, he will not be swerved from his course.
(原句中的"will not be"应与"once"引导的从句中的时态保持一致,即使用现在时。)
词汇分析:
- once作为副词时,意为“一旦;曾经;一次,一趟;一倍”。
- once作为连词时,意为“一旦…就…;一经”。
- once作为名词时,意为“一次,一回”。
相关短语:
1. once or twice - 一两次
2. all at once - 同时
3. once and for all - 彻底地
4. once upon a time - 从前
5. once bitten, twice shy - 一朝被蛇咬,十年怕井绳
6. once more - 再一次
扩展资料相关例句:
1. I feel terribly sleepy all at once. 我突然觉得特别困。
2. I have to go, I really must, at once. 我得走了,我真的必须马上就走。
3. You can't be doing two things at once. 不能一心二用。
4. For once, dad is not complaining. 爸爸这次破天荒地没有抱怨。
5. Amy picked up the hairbrush and smoothed her hair once more. 埃米拿起发梳,再次将头发梳理整齐。
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