最全情态动词的用法

情态动词的用法

一． can和could

特别提示：

（1） could用来表示请求时，语气委婉，主要用于疑问句，不能用于肯定句，回答应该用can（即：could不能用于

现在时态的简略答语中）。如： ——Could I use your dictionary?

——Yes, you can.(否定回答可用：No, I’m afraid not.) (2) can和be able to区分

can(could)和be able to都可以表示能力，意思上没有区别。但can只有现在式和过去式，而be able to则有更多的形式。如：

I’ve always wanted to able to speak fluent English.

Those bags look really heavy, are you sure you’ll be able to carry them on your own?

但是，表示在过去某时的某一场合经过一番努力，终于做成了某事，通常不用could，而用was/were able to来

表示。这时，was/were able to相当于managed to do或succeed in doing。如： After the accident it was a long time before she was able to walk again.

The fire was very big, but most people were able to escape from the building. (3) 惯用形式“cannot too ”表示“无论怎么 也不（过分）”。如： You cannot be too careful.你越小心越好。 惯用形式“cannot but+ 不定式（不带to）”表示“不得不，只好”。如： I cannot but admire her determination.我不得不钦佩你的决心。

二．may和 might

二．must和have to

四．shall和should

五．will和would

特别提示：would与used to辨析

would可用来表示过去反复出现的动作，但不能表示过去存在的状态，所以我们不能说：“she would be a quiet girl.” 另外，would强调过去某种特定情况下的活动，是完全过去的事情，同现在没有联系。而used to则着眼于过去和现在的对比，隐含现在已不存在，动作或状态都可表示。Would可以表示不规则的习惯，used to则不可。如： He used to be a naughty boy and cause trouble. I used to get up at six in the morning.

Sometimes she would take a walk in the neighboring woods.

In those days, whenever I had difficulties, I would go to Mr. Chen for help.

六．need和dare

七．ought的用法：

说明：should与ought to 表示“应该”时的区别

should 表示自己的主观看法，而ought to的语气中，含有“按道理应该 ”之意。若要反映客观情况或涉及法律义务和规定，一般用ought to。如： You should help them with their work.

You are his father. You ought to get him to receive good education.

八．“情态动词+have done”用法

的事情” 。另，还可以外示“表本来该应m ghtih vaebe e eatne by a nsarhk. 或以做某可”事意，之有含微的轻备语 2.He m责igh htavegi ev hnm moie rhel,p 气 t。houghth ews basy.u

hsuod/olghu tot avhedone

用肯于定句，表示时该做某事，而本际 上实做；未于用否定句，时则示表不该做的事 反做了。而neden’ hate vodne表做示了来本必去不的事做 。注：意 iddnt’n eed o dt 表示“没必o做要实际而也没 有做某上事”用于事后的建议，含轻微 责备的口，意吻为 当“时好最了某做” ,事其否定式 hd batteren t ohaevd neo 表示反的相义。 表含“示当时宁做了愿某”事，其 否定式w oul darthe nrot hva done e示表反的相含 义两者，都示“表悔后”意之。ha dbttee rhaved oen

1.He houlsdh vae knonw tahtth peolie coulwd nevr aelow lhti sosr of thing. 2t.Yu shoouln’d hate dvoenit s ocar elssle. 3y.Yuoou ght o thaver terune thdebo o ekalirre. .Y4u ougot nohtt ohave r feusde hs ioferf 1..oY unedn’teha e watvrede te phanlt,sfo irt s going to iain. 2.Ird dint ne’ed ot uyb hte idcitoarn. yIh daa opcyat ohe.m1 You. ha detbetr ahevs artedt arliee. r2.Youh da ebtte rnt hovae csloeddh r.e .1Iwou d lrtaehr hvea takneh si adicev.2.I wou d lrather ont ahe vtlo dhi thm etutrh

w.olu radtherh vead noe

本文来源：https://www.bwwdw.com/article/9zwi.html