什么情况下be是不用变成am is are was were 的
什么情况下be是不用变成am is are was were 的
be动词用法be动词什么情况用现在式am,are,is .什么情况下用过去式was,were ,什么情况下用过去分词be
填写适当的动词be(am, is, are, was, were)
am,is,are,be,been,was,were的区别
英文语法问题在什么情况下分别使用was did were 也就是在什么情况下使用is do are 教我的老师是台湾人,
在什么情况下用am,is,are的原形be?
be able to的be可以换成is/was/am/were/are对吧
is----------was.are---------were.am---------?
am is are was were
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.
英语中,什么情况下用BE,什么情况用IS,AM,ARE?
英语句子什么情况下不用加am is are do done did