几个英语小知识点 高人进 举例说明

Question

在完成时 since 后 加什么时态

被动语态时间状语有限制么

Answer 1

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限制，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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Answer 2

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. )