2. _____ John arrived, I was cooking
lunch. 3. ____ he grew older, he lost interest in everything except gardening. When/while When As
2.
before
It will be +一段时间+before从句(does)
要过……才能做 It will not be +一段时间+before从句
要不了…… 就能做 It was +一段时间+before从句(did) 过了……做了…… It was not+一段时间+before从句(did)
没过……做了…… 1.It will be three days before you can open
the cover of the jar.
2.It will not be ten years before we meet again.
3.It was ten years before we did the
experiment.
4. It was not long before we returned back. Examples It ishas been five years since Tom began to smoke. 汤姆吸烟有五年了。
It ishas been five years since Tom smoked a cigar. 汤姆不吸烟有五年了。 Since引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词。一般情况下,从句谓语动词用一般过去时。 句型:
It is +一段时间+ since从句 延续性动词:否定翻译 短暂性动词:直译 It ishas been three years since he graduated from college. 自从他大学毕业以来已经三年了。 It ishas been three years since he lived here. 他不住在这儿有三年了。 与强调句型结合 I didn’t go to sleep until he came back.
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