is,are was were的区别?

am,is,are,be,been,was,were的区别 was、were的用法和与is、am、are的区别 一般过去式用来表示am is are的was和were有什么区别? Is/Are supposed to do 与Was/Were supposed to do 的区别是什么?具体用法? is----------was.are---------were.am---------? am is are was were are /is was were用法 填写适当的动词be(am, is, are, was, were) am/is/are的过去时分别是was还是were? 用（is,are,was,were） 造句 用“am/is/are/was/were"填空 用am is was are were造句