Tom never went to school late before.(对划线部分提问)

问题描述:

Tom never went to school late before.(对划线部分提问)
never为划线部分.
______ _______ __________ Tom _________ to school late before?

How often did Tom go to school late before?
问频率咯
可以这样想,问Tom以前上学迟到的频率是怎样,多久迟到一次
可以回答 从不,2天就要迟到一次.等等