wasn't 和didn't怎么用例如：Tom wasn't watch TV last night .为什么要把wasn't改为didn't呢?

wasn't 和didn't怎么用例如：Tom wasn't watch TV last night .为什么要把wasn't改为didn't呢? wasn't和didn't的用法He didn't buy the book和he wasn't buying the book 有这么说的吗? she wasn't understood.为什么用wasn't,而不是didn't?什么时候用is什么时候用does? He must have been asleep at that time,(wasn't) he?为什么是用 wasn't 而不是 didn't I （didn't/wasn't） at school last Monday didn't notice 与 wasn't noticing 的区别 不高兴是didn`t happy还是 wasn`t happy She ___ at home last Sunday.(didn't stayed/wasn't stay/wasn't) 附原因! she didn't eat lunch because she wasn't hungry did后面不是要接原型吗?怎么可以用was呢? didn't doesn't don't 怎么用 didn't 、don't 、doesn't分别怎么用? 过去式变否定什么时候用didn't什么时候用wasn't或weren't如例句I didn't go to the park yesterday可不可以等于I wasn't go to the park yesterday does和doesn't和did和didn't分别怎么用?用于什么? Tom wasn't watch tv last night这句话错在哪!是将wasn't改成didn't What he said was not true,------?A、wasn't he B、didn't he C、wasn't D、was it Susan said she wasn't feeling well,_____?A.was sheB.wasn't sheC.didn't sheD.did she She saod she wasn't feeling well ,____she?A.didn't B.wasn't C.was D.did 为什么 I didn't go to John's party beacause I___A didn't invite B didn't invited C wasn't invited wasn'tI didn't go to John's party beacause I____A didn't invite B didn't invited C wasn't invited D wasn't invite 答案是C为什么