We couldn't watch until our homework was finished.为什么用couldn't 换成cann't 行不行 could 和 can 有什么区别?
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We couldn't watch until our homework was finished.
为什么用couldn't 换成cann't 行不行 could 和 can 有什么区别?
区别在于语气和事态两种情况
语气上couldn't比can't委婉点 客气点
时态上couldn't是can't的过去形式
你是句话属于后者 因为后面有was 所以为了时态一致要用couldn't
前后时态要一致,不能换,因为从句用WAS ,所以要用过去时COULDN‘T
不可以,以为后面是was,前后事态要一致。
意思为能,可以的时候,could是can的过去式。意思为可能的时候,没有太大区别,could的可能性比can小
can 一般是说能力 比如说我不会游泳就是can't 或者说我会做饭就是can
could 这里是说无法,但是这个能力不是本身的,是因为外界的(没有写完作业) can 是本身的能力
这是一个时间状语从句!主句跟从句的时间状语必须一致!后面的是was前面的当然只能是can的过去式啊!所以couldn't是不可以换成cann't的!
could是过去式里用的,过去式里不能用cant.
could 在假设语态里也要用到,例如
i could have done my homework last night. 意思就是我其实可以在昨天晚上完成作业。
We couldn't watch until our homework was finished.为什么用couldn't 换成cann't 行不行 could 和 can 有什么区别?
We couldn't see through the
Heart breaen we couldn't cry togehter
we couldn't live without others 'help
we couldn't watch the bird show because of the heavy rain.(保持句意基本不变)the heavy rain____ _____ ____ _____ the bird show.
We couldn't find them all.变同义句We couldn't find_____of_____.
We shouldn't watch too much TV_____films.
I couldn't find my lost watch if you didn't help me同义句
we never told him he couldn't do it翻译
we couldn't r__ enough money for a holiday
We couldn't have played worse翻译啊
But we couldn't find them all为什么不是found
We couldn't run in the classroom.(改为祈使句)
we couldn't listen to each other clearly(肯定句)
We couldnt walk around it on foot的意思
Walking past the park , I couldn't help__ some children flying kites.Astop to watch B stoping watch C stoping to watch D to stop to watch
Because it rained,we couldn't play football的同义句_______ _______the_______,we couldn't play football
If you want better grades,you ______ watch so much TV.答案是shouldn't ,可以用couldn't吗shouldn't ,couldn't ,有什么区别呢