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