在日常學習、工作或生活中，大家總少不了接觸作文或者范文吧，通過文章可以把我們那些零零散散的思想，聚集在一塊。范文怎么寫才能發(fā)揮它最大的作用呢？下面是小編為大家收集的優(yōu)秀范文，供大家參考借鑒，希望可以幫助到有需要的朋友。
情態(tài)動詞六年級知識點篇一
情態(tài)動詞有哪些形式?考試的時候經常會怎樣考?小編就這個四六級考試考點相關知識總結如下。
1)must have done——表示對過去的事情較有把握
的、肯定性的推測，常譯為“一定，準是，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——表示過去應該做的
卻沒有做，常含有后悔、責備、埋怨的口吻，意為“本應該”，“應該就好了”; 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——表示過去不該
做的事卻給做了，也常含有責備、不滿之意，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——表示對過去的.事情的推
測，但不十分有把握，意為“可能，或許已經”。 e.g. a traffic accident happened yesterday and a driver may have been hurt.
5)could have done——表示過去有可能或有能力做某
事，而實際未做、未能實現(xiàn)的事;有時也表示輕度批評，意為“本來可以，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——表示過去做了某事，但沒有做的必要，意為“其實沒有必要”。 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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