A: It's strange that Mike is always tardy to class these days.
B: Yeah. he's a punctual person and has never been late for school before.
tardy ( to/for )
exp. late （晚的，遲到的）
e.g. Steven was tardy to work this morning and alleges that his bus was late.
e.g. He was tardy for the bill in his response.
e.g He was tardy in paying the money.
Come on, we'll be tardy to the theatre.
be later for：做某事晚了，遲到
e.g. Oversleeping is not a valid excuse for being late for school.
e.g I'msorry that I must dash away now because I'm already late for the concert.