在日常学习、工作或生活中，大家总少不了接触作文或者范文吧，通过文章可以把我们那些零零散散的思想，聚集在一块。范文怎么写才能发挥它最大的作用呢？下面是小编为大家收集的优秀范文，供大家参考借鉴，希望可以帮助到有需要的朋友。
情态动词六年级知识点篇一
情态动词有哪些形式?考试的时候经常会怎样考?小编就这个四六级考试考点相关知识总结如下。
1)must have done——表示对过去的事情较有把握
的、肯定性的推测，常译为“一定，准是，肯定”，其否定形式是can’t/couldn’thave done，意为“决不可能，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——表示过去应该做的
却没有做，常含有后悔、责备、埋怨的口吻，意为“本应该”，“应该就好了”; 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——表示过去不该
做的事却给做了，也常含有责备、不满之意，意为“本不该”。
e.g. you shouldn’t have gone back to work yesterday without the doctor’s permission.
4)may/might have done——表示对过去的.事情的推
测，但不十分有把握，意为“可能，或许已经”。 e.g. a traffic accident happened yesterday and a driver may have been hurt.
5)could have done——表示过去有可能或有能力做某
事，而实际未做、未能实现的事;有时也表示轻度批评，意为“本来可以，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——表示过去做了某事，但没有做的必要，意为“其实没有必要”。 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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