can’t / couldn’t have

can’t / couldn’t have couldn't与can't的区别! can't与couldn't的区别 can't和couldn't区别? --that car must have cost a lot of money.--on,no._________请问否定回答用 it didn't 还是用 it can't.不过记得是这样的 must have v-ed 否定形式为：can’t / couldn’t have v-ed,为什么又用it didn't 还是与can't/couldn't hav 表示否定推测只能用can't 和 couldn't 表示否定推测只能用can't 和 couldn't couldn't是can't的过去式吗couldn't的原型是can't吗?0 - 离问题结束还有 14 天 23 小时 couldn't的原型是can't吗?couldn't是过去式吗 may not/can't/couldn't/needn't/mustn't举例区别意思和用法 在句子中如何使用couldn't,mustn't,can't,needn't? As she was very weak,she couldn't move这里的couldn't与can‘t区别,couldn't表示过去时? The box was so heavy that I couldn't lift it .中为什么用couldn't 而不用can't can的疑问句否定回答能用couldn't I can do anything,but I couldn't do everything.为什么后半句can要变成couldn't Last year ,he couldn't drive a car ,but now he can .为什么选couldn't,can?还有例句. 英语翻译I couldn't agree moreI don't agree moreI can't agree more She （ ）see,and she （ ）hear lasShe （ ）see,and she （ ）hear last year.A：couldn't /can't.B:couldn't /couldn't .C;can't /can't. 用can、can't、could、couldn't写一篇关于自己的短文 不少于60词