should、must、needto、haveto、oughtto的区别?

Question

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

Answer 1

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”