couldn't和shouldn't的区别,急要

couldn't和shouldn't的区别,急要 couldn't 和shouldn't 区别,You( )play computer games very often.A.couldn‘t B.shouldn't 求两组英语句型的解释could have done 和 couldn't have doneshould have done 和 shouldn't have done should have done和shouldn't have done,couldn't have didn't 和couldn't的区别, couldn't have done和couldn't do的区别 couldn t和 needn't和 mustn't和shouldn't和ought't的区别? could和couldn't的不同 couldn`t的意思和时态 should 和 shouldn't 分别+ shouldn't have done 和shouldn't do 区别 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 shouldn't的完整形式 shouldn't的肯定形式 I couldn't bear it 和I couldn't bear this的区别 can't和couldn't区别? should have done ,shouldn't have done.could have done,couldn't have done