when「when和while的区别」
when是什么意思中文
when
英 [wen] 美 [hwen; hwɛn]
adv. 什么时候;(用于时间的表达方式之后)在那时;其时;当时

conj. 在…时;既然;如果
pron. 什么时候;那时
n. 时间,时候;日期;场合
[例句]Smart reacted cagily when Chelsea were mentioned.
听到切尔西的名字时,斯马特就不愿意多说了。
扩展资料:
when的同义词:what time
what time 英[wɒt taɪm] 美[wɑːt taɪm]
[词典] 几点; 什么时候; 什么时间;
[例句]What's the time?; What time is it?
几点钟了?
when是什么词性
when词性有副词、介词、连词和名词四种。
when,英语。
[英][wen] [美][wɛn]
adv.什么时候; (用于时间的表达方式之后)在那时; 其时; 当时;
conj.在…时; 既然; 如果;
pron.什么时候; 那时;
n.时间,时候; 日期; 场合。
扩展资料
1、[adv.]
(1)[疑问副词]什么时候,何时,在什么情况下;
用于疑问句首,如 When do you begin your classes?
(2)从前,以前;当年: When you were a child, you didn't know what it means.
(3)在……时候:His wife always complains when he **oke.
(4)[关系副词]彼时,其时:Where when he knows wrong, he doesn't admit.
2、[conj.](常用于连接两件事)
(1)什么时候:He told us when to eat.
(2)届时,在那时:He came at six, when the sun was setting.
(3) 是……的时候了:He came at a time when we needed help.
(4)当……时,在……的时候:When we are at college.
(5)每逢,每当:She **iles when you praise her.
(6)相反,而,却:To complain of one's lot when one might change it.(本来可以改变自己的命运,却自怨命苦。)
(7)既然,鉴于:How can he help when they won't let him.
3、[pron.]
什么时候(常用于定语从句):It was in the morning, when he died.
4、[n.]
时间:When in doubt, leave out.
when是什么意思
一、adv. 什么时候;当……时。
举例:
1、When did that happen?
那件事是什么时候发生的?
2、They stood respectfully when he entered the room.
当他走进房间时,他们都恭恭敬敬地站着。
二、conj. 然后;可是;当……时。
举例:
1、I stayed till noon, when I went home.
我留到中午,然后就回家了。
2、But when I returned the door was open.
可是回来时门是开着的。
when用法
1、when的基本意思是“什么时候”,可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句。
2、when可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句,表示“是……时候的事”。
3、当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。
4、when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。
when是什么意思?
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.

