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情態(tài)動(dòng)詞六年級(jí)知識(shí)點(diǎn)篇一
情態(tài)動(dòng)詞有哪些形式?考試的時(shí)候經(jīng)常會(huì)怎樣考?小編就這個(gè)四六級(jí)考試考點(diǎn)相關(guān)知識(shí)總結(jié)如下。
1)must have done——表示對(duì)過(guò)去的事情較有把握
的、肯定性的推測(cè)，常譯為“一定，準(zhǔn)是，肯定”，其否定形式是can’t/couldn’thave done，意為“決不可能，不太可能”。
e.g. since the ditch is full of water, it must have rained last night.
2)should/ought to have done——表示過(guò)去應(yīng)該做的
卻沒(méi)有做，常含有后悔、責(zé)備、埋怨的口吻，意為“本應(yīng)該”，“應(yīng)該就好了”; e.g. with all the work finished, i should have gone to your birthday party last night.
3)shouldn’t/ought not to have done——表示過(guò)去不該
做的事卻給做了，也常含有責(zé)備、不滿(mǎn)之意，意為“本不該”。
e.g. you shouldn’t have gone back to work yesterday without the doctor’s permission.
4)may/might have done——表示對(duì)過(guò)去的.事情的推
測(cè)，但不十分有把握，意為“可能，或許已經(jīng)”。 e.g. a traffic accident happened yesterday and a driver may have been hurt.
5)could have done——表示過(guò)去有可能或有能力做某
事，而實(shí)際未做、未能實(shí)現(xiàn)的事;有時(shí)也表示輕度批評(píng)，意為“本來(lái)可以，完全可以”。 e.g. the gas leakage could have been avoided if the
gas company took immediate measures after the warning call.
6)needn’t have done——表示過(guò)去做了某事，但沒(méi)有做的必要，意為“其實(shí)沒(méi)有必要”。 e.g. i needn’t have bought all that wine——only three people came.
would rather, would sooner, would (just) as soon, had rather, had better, had sooner, cannot but, may/might as well
[例1]you all those calculations! we have a computer to do that sort of thing.
a. needn’t have done b. must not have done
c. shouldn’t have done d. can’t have done
[例2]i to him because he phoned me shortly afterwards.
a. ought to have written b. must have written
c. couldn’t have written d. needn’t have written
[例3]you those letters. why didn’t you
a. should post b. must have posted
c. should have posted d. ought to post
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