I was 的过去式可以用 I'm 吗.I was 加上‘ 是不是还是 I'm.没听说过I’as 什么的.

I was 的过去式可以用 I'm 吗.I was 加上‘ 是不是还是 I'm.没听说过I’as 什么的. 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? I'm sorry I forgot to clean the classroom为什么I‘m sorry不是I was sorry forgot是forget的过去式,为什么clean不用过去式 那 I 也是过去式用 was 一个英语句子里可以有两个过去式的词吗Another thing that I found very difficult was English grammar.found和was都是过去式,为什么要这样用? i was cooking 为什么用was was 不是 是过去式吗 S W I M 的过去式 I' m in the classroom的过去式 I am frightened. I was frighten. 的区别怎么决定过去式用在哪呢? I was drinking with my friends.过去式后面可以加ing形式吗 , 英语的 时间 加过去式 可以放在一起吗?例：7点 和 got 或 was 等7点 加 got 或 was 等 i swam at six 谓语动词是过去式动词也是过去式?谓语动词如果是过去式那么后面跟的动词也要过去式吗?例如：I WAS LOSE MY KEY还是 I WAS LOST MY KEY I was thin when I was a child.这句过去式有错吗? I的过去式 today I was very happy可以用was 吗? Thanks later that morning, when i was doing the housework, 不是过去式吗怎么用WHEN had been 是 was 的过去式吗I liked to run after I had liked to walk 这个是过去式的先后次序吗句式正确吗 现在式转换为过去式I think I was have a good time on this vacation.这句话是标准的过去式吗?