go to work，report for duty; at work; on duty; on the job
下班：get off duty; come off work; go off duty; released from duty
I need to go to work.
I have to work today.
to go to work; to report for duty; to be at work; to be on duty; to be on the job
to get off duty; to come off work; to go off duty; to be released from duty
be on/off duty
go to work; go on duty
come off work;come off duty
I'm going to work. 书面说法
I'm off to work 口语说法