英语中情态动词must, need, ought to, had better的用法
来源:范文都 本文已影响2.15W人
来源:范文都 本文已影响2.15W人
情态动词(Modal verbs)本身有一定的词义,表示语气的单词。但不能独立作谓语,只能和动词原形一起构成谓语。情态动词用在行为动词前,表示说话人对这一动作或状态的看法或主观设想。情态动词虽然数量不多,但用途广泛,主要有下列: can (could), may (might), must, need,ought to, dare (dared), shall (should), will (would) must not。
的用法
must表示“必须”:
You must tell us the truth.
你必须给我们讲真话。
must表示推测,即“肯定、准是”,限用于肯定句:
This bag must be your sister’s.
这袋子肯定是你妹妹的
They must have done it many times.
他们肯定做过许多次了。
must表示“偏偏”
We must meet with a traffic jam when we needed to hurry up.
当我们需要赶时间的时候,偏偏遇上堵车。
Just as every family turns on their lights, the power must be cut off.
正当家人开灯时,偏偏断电了。
的用法
need表示“需要”,主要用于疑问句和否定句。
Need I tell you the secret?
需要我告诉你这个秘密?
She needn’t pretend to be rich.
她不需要装阔。
You needn’t advance the date.
你们不需要把日期提前。
注意:
need也常用作实义动词。例如:
Does he need to tell lies?
他需要撒谎吗?
t to的用法
ought to表示“应该”,语气比should稍重一些:
You are a grown-up now, you ought to know how to take care of yourself.
你已是大人了,应该知道如何照料自己了。
They ought not to cheat kids.
他们不应该欺骗小孩子。
ought to表示很可能的事:
They ought to be finished now.
他们应该完成了。
She ought to pass the test this time.
她这次应该能通过测试了。
better的用法
had better表示“最好”,它作为情态动词没有人称或者数的变化,否定式是在better后面加not,不是在had后面加not。往往缩写成’d better,表示建议、劝告。
You had better give up smoking.
你是好戒烟。
She’d better not be proud.
她最好别骄傲。
本文作者:丹丹英语(公众号:英语语法学习)
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