doesnt的过去式是什么单词

　　I didn't like the job much at first.

　　起初我并不很喜欢这个工作。

　　I didn't want to go to a large university.

　　我当时不想去大的综合性大学读书。

　　There were a whole lot of people I didn't know.

　　有许多人我都不认识。