could patrol
Regular verb: patrol - patrolled- patrolled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could patrol
you could patrol
he could patrol
we could patrol
you could patrol
they could patrol 	I could be patrolling
you could be patrolling
he could be patrolling
we could be patrolling
you could be patrolling
they could be patrolling	I could have patrolled
you could have patrolled
he could have patrolled
we could have patrolled
you could have patrolled
they could have patrolled	I could have been patrolling
you could have been patrolling
he could have been patrolling
we could have been patrolling
you could have been patrolling
they could have been patrolling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not patrol
you could not patrol
he could not patrol
we could not patrol
you could not patrol
they could not patrol 	I could not be patrolling
you could not be patrolling
he could not be patrolling
we could not be patrolling
you could not be patrolling
they could not be patrolling	I could not have patrolled
you could not have patrolled
he could not have patrolled
we could not have patrolled
you could not have patrolled
they could not have patrolled	I could not have been patrolling
you could not have been patrolling
he could not have been patrolling
we could not have been patrolling
you could not have been patrolling
they could not have been patrolling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I patrol?
could you patrol?
could he patrol?
could we patrol?
could you patrol?
could they patrol? 	could I be patrolling?
could you be patrolling?
could he be patrolling?
could we be patrolling?
could you be patrolling?
could they be patrolling? 	could I have patrolled?
could you have patrolled?
could he have patrolled?
could we have patrolled?
could you have patrolled?
could they have patrolled? 	could I have been patrolling?
could you have been patrolling?
could he have been patrolling?
could we have been patrolling?
could you have been patrolling?
could they have been patrolling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not patrol?
could you not patrol?
could he not patrol?
could we not patrol?
could you not patrol?
could they not patrol? 	could I not be patrolling?
could you not be patrolling?
could he not be patrolling?
could we not be patrolling?
could you not be patrolling?
could they not be patrolling? 	could I not have patrolled?
could you not have patrolled?
could he not have patrolled?
could we not have patrolled?
could you not have patrolled?
could they not have patrolled? 	could I not have been patrolling?
could you not have been patrolling?
could he not have been patrolling?
could we not have been patrolling?
could you not have been patrolling?
could they not have been patrolling?