问题描述： 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. 1个回答 分类：英语 2014-11-16 问题解答： 我来补答 e动词am is are /was were助动词do does did情态动词cac could should must may shall 展开全文阅读
