作业帮 > 英语 > 作业

英语主句从句问题除了主语用一般将来是从句用一般现在时,例Please write to me as soon as yo

来源:学生作业帮 编辑:大师作文网作业帮 分类:英语作业 时间:2024/11/10 22:20:45
英语主句从句问题
除了主语用一般将来是从句用一般现在时,例Please write to me as soon as you come shanghai还有其他的用法是什么,就是主语用什么,从句就用什么,全的话我加分,
英语主句从句问题除了主语用一般将来是从句用一般现在时,例Please write to me as soon as yo
主从复合句中时态的一致主要有以下几种情况:
一、在以when,after,as soon as等引导的时间状语从句以及以if,unless等引导的条件状语从句中,如果主句是一般将来时,从句则用一般现在时.例如:
I'll tell her the good news when she comes back.当她回来的时候,我将把这个好消息告诉她.
If it doesn't rain,he will come here on time.如果不下雨,他会按时来这儿的.
二、在含有宾语从句的主从复合句中,当主句的谓语动词为过去时态时,从句须用表示过去的某种时态.例如:
He asked when they would go to the party.他问他们什么时候将去参加聚会.
Miss Green said she had been to Beijing before.格林小姐说她以前曾经去过北京.
三、在宾语从句中,当主句的时态为一般现在时、现在进行时、现在完成时等时态时,后面从句时态不受主句限制,可根据情况,选用各种适合的时态.例如:
Do you know when we'll have a football match?你知道我们什么时候举行足球赛吗?
You know he has gone to Shanghai.你知道他已去上海了.
四、当宾语从句表述的是客观事实、科学真理、现在的习惯动作以及格言等时,其时态不受主句限制,而用一般现在时.例如:
The teacher told us that light travels faster than sound.老师告诉我们光速比音速要快.
When I was a student,my teacher often told us that time and tide wait for no man.当我还是学生的时候,老师常常告诉我们,岁月不等人.
五、在"since+点时间"句型中,主句通常用现在完成时,从句用一般过去时.例如:
He has worked at the factory since he came here.自从他来到这儿,他就一直在这家工厂上班.
另外,在句型"It's+段时间+since+从句"中,since后面的从句要用一般过去时.例如:
It's a long time since we met last.自从我们上次见面以来已经有好长时间了.
六、在复合句中,如果主、从句表示的动作或状态都发生在过去,而且有先后,则在先的用过去完成时,在后的用一般过去时.例如:
When he got there,the train had left.当他到那儿的时候,火车已经开了.
He said he had visited the school before.他说他以前参观过那所学校.