you don't_____so fast.it's early.为什么选have to drive不选 need to

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/17 01:23:09

you don't_____so fast.it's early.为什么选have to drive不选 need to drive?

need to 与have to 的区别就在于
have to是主观上的
而need to 是客观上的
have to 是一个比较特殊的情态习语,虽然也具有情态动词的功能,但却与其他的情态动词不同.它有人称、数和时态的变化,其否定式和疑问式的构成方式也与情态动词不一样.
一、have to 与其他情态动词一样也是后接动词原形,表示外界的强制作用,强调被迫性.含有不情愿的色彩,常译为“必须,不得不”.
二、have to 可用于多种时态,而且不同时态使用不同的形式：一般现在时中,主语为第三人称单数时用has to ; 一般过去时中,用 had to.have to 还可以用在其他的情态动词之后.例如：
I have to do some washing.
我必须洗洗衣服.
She has to look after her little sister.
她不得不照顾她的小妹妹.
I had to do my homework last night.
昨晚我不得不做作业.
I think he may have to help his Dad in the garden.
我想他可能不得不在花园里帮他爸爸.
三、have to 的否定式和疑问式一般要借用助动词do的适当形式构成.have to 的否定式是don’t have to; has to 的否定式是doesn’t have to; had to 的否定式是didn’t have to.have to的疑问式同样也借用助动词do的相应形式构成.例如：
He doesn’t have to do the homework now.
他没有必要现在做作业.
—Do I have to go there now?
我现在就得去那儿吗?
—Yes,you do.（No,you don’t have to.）
是的,你必须去.（不,你不必.）
We didn’t have to answer the question yesterday.
昨天我们没有必要回答这个问题.
need to 是主动形式,表示的也是主动的意思
need to 与have to 的区别就在于 have to是主观上的
而need to 是客观上的

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