大师作文网while when as
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想问一下 while when as 的区别 不要太复杂，说一下在时间状语从句中，主句和从句的时态分别怎样用。 谢谢
解题思路： 从具体的用法上区别。
解题过程：
while与when以及as的区别：
1.当从句中的谓语动词是持续性的动作时,我们可以用while, when或as。While / When / As I was walking down the street, I noticed a police car in front of the bank.我顺着马路往前走时,发现银行门前停着一辆警车。2. 当从句中的谓语动词表示瞬间动作时,不可用while,只能用when 或as .He was on the point of leaving when/as someone knocked at the door. 他正要走,这时有人敲门。3. 如果谈论两个长动作,最常用的是while。While John was doing his homework, his father was watching TV.约翰在做作业时,他的爸爸在看电视。, as是可以用来说明两种正在发展或变化的情况的,这时as引导一个持续性的动作,主句中的动作与之同时进行。As we talked on, he got more and more excited. 我们继续往下谈的时候,他越来越兴奋。4. 如果表示两个短动作或事件同时发生,最常用的是as或when。s he caught the ball, there was a tearing sound. 当他抓住球的时候,有一种撕裂的声音。I thought of it when you opened your mouth. 就在你要说话的时候,我也想到了。
不过
A
最终答案：略
解题过程：
while与when以及as的区别：
1.当从句中的谓语动词是持续性的动作时,我们可以用while, when或as。While / When / As I was walking down the street, I noticed a police car in front of the bank.我顺着马路往前走时,发现银行门前停着一辆警车。2. 当从句中的谓语动词表示瞬间动作时,不可用while,只能用when 或as .He was on the point of leaving when/as someone knocked at the door. 他正要走,这时有人敲门。3. 如果谈论两个长动作,最常用的是while。While John was doing his homework, his father was watching TV.约翰在做作业时,他的爸爸在看电视。, as是可以用来说明两种正在发展或变化的情况的,这时as引导一个持续性的动作,主句中的动作与之同时进行。As we talked on, he got more and more excited. 我们继续往下谈的时候,他越来越兴奋。4. 如果表示两个短动作或事件同时发生,最常用的是as或when。s he caught the ball, there was a tearing sound. 当他抓住球的时候,有一种撕裂的声音。I thought of it when you opened your mouth. 就在你要说话的时候,我也想到了。
不过
A
最终答案：略