should、must、need to、have to、ought to的区别？

should表示“按道理应该”
must表示“主观上必须”
eg:We must clean the classroom because we should keep it clean.
need to“有必要做”
have to表示“客观上不得不”
eg:We have to clean the classroom because it is too dirty.
ought to表示“主观上应该”

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