Only one of the government staff Xiao Zhang, Xiao Wang, Xiao Li and Xiao Thursday was late  When the director asked who was late, they gave the following answer  Xiao Zhang: Xiao Li is late  Xiao Wang: although I came later than usual, I was not late  Xiao Li: not only am I not late, but I came early
Xiao Zhou: if Xiao Wang is not late, then I am late
Zhou arrived late