But his wife isn't very lucky.请问可以用don't 代替isn't吗?为什么?

But his wife isn't very lucky.请问可以用don't 代替isn't吗?为什么? his wif isn,t very lucky His wife isn't lucky的同义句 his German isn t very The child isn't very smart,but his mother always don't not isn't the story is very interesting,isn't it —Yes ,but I don't thi Isn`t he lucky!是什么句子 There isn't very much But sometimes they don't understand her __1_she isn't___2_at don't和isn't的用法? Don't ,isn't有什么区别