那 I 也是过去式用 was

那 I 也是过去式用 was 状语从句I saw a UFO while i was walking down the street yesterday.这里主句是过去式,那从句怎么用was walking 不是说主句是一般过去式,从句是过去式的某个形态 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 用过去式的时候,i am a girl,这个am也是用过去式嘛? i was cooking 为什么用was was 不是 是过去式吗 关于i was worried中worried为什么是形容词?如果是,那WORRY的过去式怎么办? I heard that the traffic there was terrible.是不是 听说 都用过去式?为啥用was? i knew you were trouble为什么是用knew,也是过去式吗? I am frightened. I was frighten. 的区别怎么决定过去式用在哪呢? 为什么用过去式呢.was. 过去进行式和过去式a kind man called the police when he saw the accident后面 when he saw the accident 是一个动作Mary was having dinner when i saw herwhen i saw her 也是个动作 为什么前者用过去式 后者用进行市?什么 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 busy this morning 用三单作主语怎么改过去式could 怎么改 I was in London on business for a week last month为什么用一般过去式 i was also afraid to speak in class afraid为什么用过去式 I heard that the traffic there was terrible.为啥用过去式? later that morning, when i was doing the housework, 不是过去式吗怎么用WHEN 英语-为什么是I was born?born不是本身就是bear的过去式么?那我出生,这个动作我觉得不应该用被动啊 我觉得I born in 1998就可以了 那为什么非得 I was born?