is duty the on policeman怎么连词成句急

The police are duty on the duty on road.这里为什么用are 而不是用is? is on duty today who is on duty Today is my on duty for the day. is duty the on policeman怎么连词成句急 who is on duty today what is on duty today? Who is on duty today?为什么用on duty _____lily______?A.Is,on duty B.Dose,on duty the girl in/on red sweater is in/on duty today betty is on duty today.she is c___ the blackborad with an eraser. Be quiet!The student on duty is beginning to give the＿(day) report. Who is on duty today ?是什么意思 谢谢 whose turn is it ( ) on duty today [what who whose]is on duty? Tim is on duty today.Look!He _____ [clean]the blackboard. The following people will on duty today. on duty