be动词、助动词、情态动词都有哪些（三到六年级的）最好有音标.

题目

be动词、助动词、情态动词都有哪些（三到六年级的）最好有音标.

答案

be动词
am is are /was were
助动词
do does did
情态动词
cac could should must may shall