I could police you could police she could police we could police you could police they could police
V-ing form
I could be policing you could be policing she could be policing we could be policing you could be policing they could be policing
Perfect
I could have policed you could have policed she could have policed we could have policed you could have policed they could have policed
V-ing perfect
I could have been policing you could have been policing she could have been policing we could have been policing you could have been policing they could have been policing
Negation
Simple form
I could not police you could not police she could not police we could not police you could not police they could not police
V-ing form
I could not be policing you could not be policing she could not be policing we could not be policing you could not be policing they could not be policing
Perfect
I could not have policed you could not have policed she could not have policed we could not have policed you could not have policed they could not have policed
V-ing perfect
I could not have been policing you could not have been policing she could not have been policing we could not have been policing you could not have been policing they could not have been policing
Interrogative form
Simple form
could I police? could you police? could she police? could we police? could you police? could they police?
V-ing form
could I be policing? could you be policing? could she be policing? could we be policing? could you be policing? could they be policing?
Perfect
could I have policed? could you have policed? could she have policed? could we have policed? could you have policed? could they have policed?
V-ing perfect
could I have been policing? could you have been policing? could she have been policing? could we have been policing? could you have been policing? could they have been policing?
Interro-negative form
Simple form
could I not police? could you not police? could she not police? could we not police? could you not police? could they not police?
V-ing form
could I not be policing? could you not be policing? could she not be policing? could we not be policing? could you not be policing? could they not be policing?
Perfect
could I not have policed? could you not have policed? could she not have policed? could we not have policed? could you not have policed? could they not have policed?
V-ing perfect
could I not have been policing? could you not have been policing? could she not have been policing? could we not have been policing? could you not have been policing? could they not have been policing?