何时使用BE【am/is/are/was/were/has(have)been】?
何时使用BE【am/is/are/was/were/has(have)been】?
am,is,are,be,been,was,were的区别
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
am\are\is was\were been 分别是什么时态?
英语中am,are,is,was,were,there is,there are,has,have,does,do 的主
填写适当的动词be(am, is, are, was, were)
英语系动词的用法.英语中有 was .is,are,has been,have benn,will,would,were
is----------was.are---------were.am---------?
am is are was were
am is are be been
用be动词(am,is are ,was,were)的正确形式填空