the coat I bought yesterday is /was expensive?是填is 还是was

This morning,I went to the shop and change the coat I bought.改错, This is the shop where/which I bought the coat yesterday哪一个,为什么 He bought the same coat that i was wearing yesterday?为什么不能用that? the coat I bought yesterday is /was expensive?是填is 还是was I have（ got） the coat for 8 weeks.got 换成 bought 行不行? I have bought the coat for 8 months.这句话对吗?我总觉得不对,感觉I have had the coat for . The coat cost so little that I bought it.同义句The coat__ __ __ for me to__. The coat bought last week is too big for me .I'd like to change it for a _smaller____one对吗? The coat I bought yesterday is not expensive at all.As a matter of fact,Iwould gladly have paid__f The coat was bought in Shanghai.是什么时态, She bought the coat on her( )四十birthddy..急用 Tom bought the coat yesterday.同义句转换tom __ __ the coat __ __ __ The coat bought last week is too big for me .这句话的有语法错误吗?还是应该改成The coat I bought last week is too big for me .或者The coat was bought last week is too big for me .为什么第二种改法的which不能省略呢？第 The coat bought last week is too big for me .I'd like to change it for a small one对吗? You have the same coat ______ I bought for my brother.选哪个?A) with B) that C) which D) as is this coat the one you bought last week? 为啥用THE ONE 而不是which,that? i bought a coat last month in paris 这句话对的错的 this the coat he is which bought yesterday怎么组成一句话?