doesn't have to 是什么意思？为什么我们老师说doesn't have 等于 need to?

Question

那天英语考了这题。 我去问老师 老师说doesn't have to 就等于 need to但是我又去问课外英语班的老师 说 doesn't have to 等于 don't need to 告诉我正确答案

Answer 1

don't have to=don't need to,意思是“没有做某事的必要，没有必要做某事"，have to(必须做某事)=need to（需要做某事）

Answer 2

have to =need to 需要，必须因此 doesnot have to=don't need to

Answer 3

don't need to