am is are be been

问题描述:

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 am is?
有了am is are 为什么要有BE呢 COPY者不用COPY ,我一定不给最佳答复!

1.am is are 的区别am只用在I 后面,如 I am a girl 我是女孩第三人称单数后面跟 is 如 He/She/It/Jim/is 其他跟 are,如 They/we/girls/boys are2.什么情况下用Be?借助外加助动词如do,did.或者在情态动词如can,will,w...