求英语复合句时态公式!比如When后面用什么时态?Since后面用什么时态?While后用什么时态?If后用什么时态?

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/07/01 01:30:24

/>以下例句:
I was sleeping when he was wathcing TV.（过去进行式)
= When he was wathcing TV,I was sleeping.
Every day I read newspaper when I eat breakfast.（现在式）
= Every day when I eat brakfast,I usually read newspaper.
What do you have to do when you go to school?(现在or未来式皆可)

(1)since + 过去一个时间点 (具体的年、月、日期、钟点).
I have been here since 2002.
(2)since +一段时间+ ago
I have been here since six months ago.
(3)since +从句
I'm very sad since you left.
(4)It is +一段时间+ since从句
It is six months since I came here.
>
while所接子句中的动词是进行式or单纯式,但需要是有持续性的动作或状态
例:While there is life,there is hope.(有生命就有希望)
>
对现在、将来不确实事情的推测or对现在的事实相反的假设or与过去事实相反的假设皆可;
if 后面所连接的子句,可放在句首也可放在句中,但若是放在句首,则和其后子句间要用逗号分开.
例:I won't go out if you come here tomorrow.
=If you come here tomorrow,I won't go out.

求英语复合句时态公式!比如When后面用什么时态?Since后面用什么时态?While后用什么时态?If后用什么时态? since前用什么时态,后用什么时态 when后面的句子用什么时态 when it后面用什么时态 found后面用什么时态 will后面用什么时态 will后用什么时态 could后用什么时态 since+一段时间用什么时态 since then用什么时态英语中的since,after,when等等后面一般用什么时态? if后面跟什么时态