am/is/are的过去时分别是was还是were?
am/is/are的过去时分别是was还是were?
is----------was.are---------were.am---------?
am is are was were
(is am are)+过去分词与(was were)+过去分词怎样区别?
am is are was were作为助动词时,后面的谓语动词还是原型吗.
填写适当的动词be(am, is, are, was, were)
am,is,are,be,been,was,were的区别
be+过去分词怎么确定be是is还是are还是were还是was?
用“am/is/are/was/were"填空
用am is was are were造句
用am,is,are,was,were填空.
is am are does was were did的过去时造肯定句 否定句 一般疑问句 特殊疑问句 反义疑问句