need有两种用法,一种是情态动词（need do）一种是实义动词（need to do）
那么当情态动词时否定就是needn't do实义动词时就是don't need to do
举个例子：
你不需要上学.
第一种：You needn't go to school
第二种：You don't need to go to school.
Needn't和don't need to的区别
need有两种用法,一种是情态动词（need do）一种是实义动词（need to do）
那么当情态动词时否定就是needn't do实义动词时就是don't need to do
举个例子：
你不需要上学.
第一种：You needn't go to school
第二种：You don't need to go to school.