I did not enjoy it为什么用did而不用could

I did not enjoy it为什么用did而不用could 新概念2 I did not enjoy it（这里为什么用did,不可以用could?） 新概念第二册第一课,I did not enjoy it. 可不可以用could代替did? i did not enjoy it.为什么不是i not did enjoy it. I did not enjoy it可以改为I could not enjoy it吗? 英语1.I did not enjoy it.2.I could not bear it.did和could有什么区别, I could not hear the actors为什么用could不用did? The play was interesting.I did not enjoy it. 新概念第二册第一课 i did not enjoy it. he did not understand English.句中的为什么用did 而不用was? it did not prove to be a problem为什么用did?不用was What do you think of the concert?I really enjoy it.I did not