that's 可以做that was的缩写么?

that's 可以做that was的缩写么? that was 可以等于that's吗 that was 可以缩略成that's That's why和That's because区别 that's why i was late for the appointment.that's why 做什么成分? The man (that) I met yesterday was Tom’s father.that为什么做表语?我觉得是宾语吧 可以换作which吗? that's =that is or that was?rtthat's =that was? that's= that was?that's sometime= that was? That’s changed since I was here.That’s changed since Iwas here.这个句子中,'s可以改成was么?为什么？ 第一段的最后一句,that's changed since i was here中,that's 是that is 的缩写还是that has的缩写 not that的用法not that charlie's own life was easy!可not that如何使用? The first time that I went away from home without my parents was when I was ten.that 从句做什么成分?that 可以省略吗? “So that's what it was! That day was April Fool's Day That's OK可以作为Let's go的答句吗? 4.I was so angry at all that he was doing that l walked out这里的at all that he was doing 是做什么成份的 Betty’s grandmother was cooking at that time 变为一般疑问句,并做肯定回答. That's exactly what I was trying to say 是什么从句?what做什么成分! it is said that的固定结构可以改成 it was said that?