英语语法don't have to 与 don't need to的区别和用法don't need to和 needn'

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/04/28 01:51:16

英语语法
don't have to 与 don't need to的区别和用法
don't need to和 needn't to do的区别和用法
什么是现在完成时句型怎样?结构?用法?

don't have to是不必要做某事的意思,有客观因素
don't need to主要是主观因素
needn't to do 不就是don't need to吗?只不过need以前可以用作情态动词的,needn't 后面直接加do,现在基本没人用了
用法么,have to 和need to 学过吧?套着用吧
现在完成时就是have/has done,表示过去发生的事现在仍在发生,或者对现在存在着影响
e.g.
China has changed a lot since 1949. 改变已发生,仍在继续
She has been to China. 她来过中国,这件事做过了,并且已经产生了影响：那就是她来过中国了,不可改变.

英语语法don't have to 与 don't need to的区别和用法don't need to和 needn' needn't needn't have done 和don't need to 的区别 don't need to 和needn't don"t need和don't have to 的区别? "don't need to" 与 "don't have to"、"needn't" 的意义相同吗 needn't和don't need to有什么区别?haven't和 don't have 有 need t和don t have to的区别 needn't和don't need的区别和用法? needn't 和 don't need to 有什么不同? needn't to come,don't need come,don't need coming与needn't co need not 和 don't have to 的区别求英语大神帮我讲解 don't need 和needn't 的区别即用法要加to嘛?