She sang ___ she went along.(填入适当的引导词) 为什么用as而不用w...

as 表示伴随的状态，且前后时态一致。而when表示伴随的动作时，主句必须是进行时。谢谢采纳。

严格说，都不对。因为go是非延续性动词。前者应该把went改为walked。后者应该把as 改为while，going 改为walking。不过二者意思不一样。前者是边走边唱，后者是在走路时唱了歌。

as和when可与非延续性动词连用，而while只能与延续性动词连用 as和when都可用来指一段时间，但as强调主句和从句表示的动作同时发生，而while强调主句表示的动作是在while从句的动作延续中发生的 She sang as she went along她边走边唱歌 She sang while she went along她走路时一直在唱歌 ...

（3）as强调主句谓语动词与从句谓语动词表示的动作同时发生；while强调主句谓语动词表示的动作持续于while从句所指的整个时间内；when可以指主句谓语动词和从句谓语动词所表示的动作同时或先后发生.例如：She sang as she went along. （她边走边唱.）Please listen to me carefully while I read. （我朗...

但是,若主从句表示的两个同时进行的动作含有“一边…一边”之意思,通常用 as:She sang as she went along. 她边走边唱。(3) 若从句是一个短暂性动作,主句是一个持续性动作,可用 as / when 但不用 while:It was raining hard when [as] we arrived. 我们到达时正下着大雨。(4) 若主从句表示的是两...

25. ___ she grew older, she became more responsible. when 练习题 I .填入适当的引导词 1. I haven't heard from him ___ he went to America . since 2.He won't be here ___ he is invited . unless 3. He will not go to the cinema ___ he is very busy . because ...

I .填入适当的引导词 1. I haven't heard from him ___ he went to America .2.He won't be here ___ he is invited .3. He will not go to the cinema ___ he is very busy .4. We found the key ___ she lad left it .5. We found the books two days ___ he had...

2）当从句的动作发生于主句动作之前，只能用when 引导这个从句，不可用as 或 while。When you have finished your work, you mayhave a rest.3）从句表示"随时间推移"连词能用as，不用when 或while。As the day went on, the weather got worse.日子一天天过去，天气越变越坏 4）When: 表示时...

As he walked along(沿着走) the lake, he sang happily.He had learned a little Chinese before he came to China.After he finished middle school, he went to work in a factory.(2)在时间状语从句里,通常不用将来时态,用现在时态表示将来的动作或状态。例如:I’ll ring you up as soon as I get...

No matter how hard he tried, she could not change her mind. 比较状语从句 引导词:as(同级比较), than(不同程度的比较), 特殊引导词:the more … the more … ; just as …, so…; A is to B what /as X is to Y; no … more than; not A so much as B She is as bad-tempered as...