when怎么读
When读作:英[wen]美[wen]。
一、when的翻译:
何时;在…时;时候。
二、when的词性:
adv.何时;pron.何时;conj.当…时;n.时候。
三、近义词:
while。
四、when和while的区别:
1、when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。
They were sweeping the floor when the teacher came in.
老师进来时(这一时刻),他们在擦地板。
While they were sweeping the floor,the teacher came in.
他们正擦地板时(这段时间),老师进来了。
2、when说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。例如:
They were singing while we were dancing.
3、如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,例如:
I am cooking while Jane is practicing.
我在做饭的时候简正在练习。
当此句改变主从句的位置时,则用when引导。
When the teacher came in,we were talking.
4、和when引导的时间状语从句主句用一般时(一般过去时)从句用进行时(过去进行).while引导的从句要加延续性动词,而when 延续和短暂性动词都可以,所以when有包含while ,while可以用when替换。
5、另外,when和while的区别还在于:while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态。
While they were talking , the bell rang.
正在他们谈话的时候,上课铃响了。
I was doing my homework when my mother came back home yesterday evening.
昨天晚上妈妈回家的时候,我正在做家庭作业。
例句:
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。
3、And they roared when Seaman held up two fingers.
然后当希曼伸出两根指头的时候他们就吼叫起来。
4、I stayed till noon, when I went home.
我留到中午,然后就回家了。
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