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(gè)工作。

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

　　我當(dāng)時(shí)不想去大的綜合性大學(xué)讀書。

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

　　有許多人我都不認(rèn)識。