发布网友 发布时间:2022-05-14 05:43
共6个回答
热心网友 时间:2022-07-11 09:04
1、when doing用法
When从句的主语和主句的主语是同一个或同一些人时,从句的谓语动词为be动词+doing形式,可以把从句的主语和be动词省略,即用when doing sth是指当做……事情时, 如:
when doing the work,we should be careful.
完整一点的说法是when (we are) doing the work,we should be careful.
当工作的时候,我们要仔细。
2、When后面接do的用法:
(1)when引导状语从句时,通常后面要接从句,当为一般现在时,用do动词形式。如:
when you do your homework,you should be careful.
当你写作业时,你要仔细。
(2)When引导疑问句时,一般现在时
when do you do your homework?
你什么时候写作业?
扩展资料:
When,while,if,once,unless,though引导的状语从句,当从句主语和主句主语相同时,可将从句主语删除,动词采用现代分词形式doing。
when后接doing,doing这个动作表示的是正在进行的动作,且和逻辑主语是主动关系。
如:When you drive a car,you should be alert.
可以写作When driving a car,you should be alert.
当你开车时,要小心。
热心网友 时间:2022-07-11 10:22
when在英语里有三种词性:
特殊疑问词,“什么时候”,后面跟一般疑问句语序。如:
When were you born?
When will the class begin?
When do you start work and finish work?
从属连接词,“当什么时候”,引导时间状语从句,后接陈述句的语序,如:
He always helps me when I am in trouble.
When my dad came back, I was watching TV.
缩合连接副词,引导名词性从句。
This was when I was born.
Do you know when the class will begin?
I don't know when they will achieve the goal.
此外,疑问副词when后面加动词不定式to do(注意,when后面没有接动名词doing的用法),可以作句子的主语,表语、宾语等,如:
I don't know when to use the sentence pattern.
When to go is a problem.
The problem is when to begin the class.
热心网友 时间:2022-07-11 11:57
when doing 当做....事情时追答那就区别下 to do 和do就行了。
热心网友 时间:2022-07-11 13:48
when 主语 be doing 或者 when doing热心网友 时间:2022-07-11 15:56
羸马夹双辕。愿借羲皇景,追问。。
热心网友 时间:2022-07-11 18:21
主要是看前后句