I can patrol you can patrol he can patrol we can patrol you can patrol they can patrol
V-ing form
I can be patrolling you can be patrolling he can be patrolling we can be patrolling you can be patrolling they can be patrolling
Perfect
I can have patrolled you can have patrolled he can have patrolled we can have patrolled you can have patrolled they can have patrolled
V-ing perfect
I can have been patrolling you can have been patrolling he can have been patrolling we can have been patrolling you can have been patrolling they can have been patrolling
Negation
Simple form
I can't patrol you can't patrol he can't patrol we can't patrol you can't patrol they can't patrol
V-ing form
I can't be patrolling you can't be patrolling he can't be patrolling we can't be patrolling you can't be patrolling they can't be patrolling
Perfect
I can't have patrolled you can't have patrolled he can't have patrolled we can't have patrolled you can't have patrolled they can't have patrolled
V-ing perfect
I can't have been patrolling you can't have been patrolling he can't have been patrolling we can't have been patrolling you can't have been patrolling they can't have been patrolling
Interrogative form
Simple form
can I patrol? can you patrol? can he patrol? can we patrol? can you patrol? can they patrol?
V-ing form
can I be patrolling? can you be patrolling? can he be patrolling? can we be patrolling? can you be patrolling? can they be patrolling?
Perfect
can I have patrolled? can you have patrolled? can he have patrolled? can we have patrolled? can you have patrolled? can they have patrolled?
V-ing perfect
can I have been patrolling? can you have been patrolling? can he have been patrolling? can we have been patrolling? can you have been patrolling? can they have been patrolling?
Interro-negative form
Simple form
can't I patrol? can't you patrol? can't he patrol? can't we patrol? can't you patrol? can't they patrol?
V-ing form
can't I be patrolling? can't you be patrolling? can't he be patrolling? can't we be patrolling? can't you be patrolling? can't they be patrolling?
Perfect
can't I have patrolled? can't you have patrolled? can't he have patrolled? can't we have patrolled? can't you have patrolled? can't they have patrolled?
V-ing perfect
can't I have been patrolling? can't you have been patrolling? can't he have been patrolling? can't we have been patrolling? can't you have been patrolling? can't they have been patrolling?