Question

一道英语填空题~

You needn't pay for that phone call(保持原句意思)

You___ ____ to pay for that phone call
为什么不能填don't need 一定要填don't have额~
谢谢了！！！

Answer 1

needn't do sth. 中的need是情态动词,表示: 没必要
如果填don't need to do sth. 中的need是行为动词,意思是: 不需要
don't have to do sth. 表示: 没必要,所以用dong' have

Answer 2

因为don't need 后是不能带有介词to的，need后用动词原形。You don't have to pay for that phone call.... don't have to= don't need

Answer 3

do not have to do

Answer 4

当need为情态动词时，意思是“必要”，否定为"needn't"，后面大多接动名词，表示动作；
当need为实义动词时，意思是“需要”，否定为"don't need",后面大多跟名词。