be.am.is.are.were.was.been.being.分别是什么时候用的

be 是 is am are is,am,are,was,were,being,been,to be怎么用 be.am.is.are.were.was.been.being.分别是什么时候用的 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 何时使用BE【am/is/are/was/were/has（have）been】? 什么情况下be是不用变成am is are was were 的 在句子中什么时候用be,什么时候用am,is,are,was,were?be这个词什么时候出现在句子里？ 什么时候用be动词的原形我指的不是am,is,are,was,were哦,是be哦. am is are什么时候用原形be be动词有那些is,am,are 什么时候用be is are am am is are是be动词吗? 什么时候用be,而不是am,is,are 就是be,is,am.are的区别 be动词am.is.are的问题 am is are be been我读被这些词弄糊涂了我知道的关系是am is are 是BE动词 been是be的过去式am is are 应该都有过去式吧?are的过去式是were.那用be的句子在过去式就用been?那什么情况用be?什么情况用are a wa are happy?(be)with you