From Monday to Friday, each day two subgroups work in morning shifts, two in evening shifts but only one subgroup works in night shifts.

But the evening post brings Roger one last fatal scrap of information.

But the evening post brought Roger one last fatal scrap of information. …

But the evening post brought Roger one last fatal scrap of information.

In the traditional slowly rotating shift systems, shifts change weekly; that is, a week of night shifts is followed by a week of evening shifts and then a week of morning shifts.

30.01 An employee will receive a shift premium of fifteen dollars ($15) for each shift worked on the 16:00 to 24:00 evening shift and for each shift worked on the 00:00 to 08:00 night shift.