was不是is和am的过去式吗?were不是are的过去式吗?为什么可以用if i were a boy?而不用if i was a boy?

was不是is和am的过去式吗?were不是are的过去式吗?为什么可以用if i were a boy?而不用if i was a boy? 一般过去式用来表示am is are的was和were有什么区别? if he were here i would beat him 为什么不是 if he was here 不是过去式吗 am is was are才是were was not的缩写形式是什么?was是am和is的过去式·~was not是怎样缩写的~还有were not的缩写形式是什么? was 和 were有什么区别?不是都是BE的过去式吗..有什么区别 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.现在可以简单的了解一些was和were的用法,只是在有明确的时间提示里.我想问一下was 和were 有没有一些其他特 英语用am,is,are,was,were造句?造六句要用第三人称,am的过去式是wasI am a student.I was student last year. Where were you还是Where was you?are的过去式不是were吗? be+过去式 和 was/were+过去式的区别 小学五十个过去式（英语）五十个过去式呀~例：are-were 是am/is-was是一楼和二楼选那个好呢？好像二楼的比较好 am,are,is; 过去式was,were用这些给我挨个造个句子? am/is的过去式 is/am的过去式 it is raining now 怎么变过去时 it is raining now 这句变过去式 变成了：it rained yesterday.请问 为什么后面那句不加BE动词的过去式形态 were/was?不甚感激!i am back 的过去式是什么？am back 不都是动词吗 助动词和实义动词能做谓语 am is are was were +doing这里的am is are was were 是助动词吗 doing是实义动词吗 doing不是非谓语动词吗 was、were的用法和与is、am、are的区别 was后还能加动词过去式吗was和were后还能加动词过去式吗?还是用动词原形 be动词的过去式（即am,is,are)后面加什么是现在分词（动词ing）,还是动词原形或过去式?或者其他的内容.SORRY，是be动词的过去式（即WAS,WERE)后面加什么