do you need to do… 和need you do…?怎么区分?如何判断疑问词用do还是need?

题目

do you need to do… 和need you do…?怎么区分?如何判断疑问词用do还是need?

答案

need当实意动词时,有三单,need to do,疑问句要提前助动词do does did
need当情态动词时,无三单,+动词原形 提前情态动词（多用于疑问句和否定句）