几个英语小知识点 高人进 举例说明
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共2个回答
热心网友
1.只要见到since（自从）引导的短语和从句，主句的谓语动词要用现在完成时。
2.since引导的从句用一般过去时，主句用过去完成时。
3.被动语态时间状语没有，和主动语态用法一样，该用什么时态就用什么时态。
例如：一.副词 ad. (常用于现在完成时)
1.此后;从那时到现在
She left school three years ago and has worked as a nurse ever since.
她三年前毕业,从那时起便一直当护士。
二.介词 prep.
1.(常用于现在完成时)自...以来,从...至今
I haven't heard from him since last year.
我自去年以来未曾收到过他的信。
三.连接词 conj.
1.(常用于现在完成时)自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了。
She has been living a hard life since her husband died.
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热心网友
现在完成时，从1976年起我就住在这里了。
I've been here since 1976.
硬化剂反应完成时修复反应也停止了，他们不会随老化变的脆弱。
Since the curing reaction stops when the hardener has completed reaction with the base resin, they do not go brittle with age.
一段时间”表示一个动作持续的过程，通常也要与完成时连用。例如。
I have lived here for a year. (=I have lived here since this time last year. )
