is are were am was 分别是什么主语的be动词
are is were was am 分别是什么主语的be动词
is are were am was 分别是什么主语的be动词
填写适当的动词be(am, is, are, was, were)
be.am.is.are.were.was.been.being.分别是什么时候用的
用be动词(am,is are ,was,were)的正确形式填空
用正确的be动词(am ,is ,are ,was,were)填空
一般疑问句的构成?由be(am ,is,are,was,were ,) \情态动词(can
am\are\is was\were been 分别是什么时态?
am,is,are,be,been,was,were的区别
关于be动词 am,is,are 的过去式 was 和were 的用法.我已经知道was 和were 是前者的过去式.
主语+be(is/am/are)+going to+动词原形
be动词的一般过去时 否定:主语+was/were+_______+其他