"First of all, what time did you come on duty last night?"

The new man would be coming on duty in the radio room.

"I shall come on duty a little early and bring help so that we can all go together, you will see. "

The watch changed, and the night crew came on duty.

When the night man came on duty, he didn't know whether you were down or up.

I just came on duty and was assigned here with you.

"Could not someone have hidden in the garden from before you came on duty?"

Then he would have two days to himself before coming back on duty.

Sister will want to see you when she comes on duty.

"When will he be ready to come back on duty?"