Used Tom to watch too much TV after school?
Did Tom use to watch too much TV after school?
used to变成否定句或者疑问句有两种方法：
疑问句如你的题目所示.
否定句的例子：
The shops usedn't to open on Sundays.
这些商店过去在星期天不开门.
I'm surpirsed to see you smoking.You didn't use to.
你抽烟我很惊讶,你过去可不抽.
记住就行了.