He needn't finish his work at once,need he? He doesn't need to finish his work at once doe

He needn't finish his work at once,need he?
He doesn't need to finish his work at
once does he?
两句话意思是否一样

是一样的，一个need是作情态动词，即need(not) do sth.
另一个是作实义动词，即(don't/doesn't/didn't)need to do sth.

1.首先need to do 是需要做........,need 为实义动词。 don't need to 就是上面的否定形式。不需要做......这里面need 还是实义动词 2.needn't为情态动词。后面接实义动词原型。即needn't do ....意思是“不需要做....” 3.need to be done ： 某物需要被做。。。 例：the car need to be repaired. 汽车需要（被）修理（汽车和动作修理之间是被动关系不是主动关系） 4.need doing主动表被动的用法 =need to be done. 即 the car need repairing.=the car need to be repaired.

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