doesnt的過去式是什么單詞

　　I didn't like the job much at first.

　　起初我并不很喜歡這個工作。

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

　　我當時不想去大的綜合性大學讀書。

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

　　有許多人我都不認識。