I can water you can water he can water we can water you can water they can water
V-ing form
I can be watering you can be watering he can be watering we can be watering you can be watering they can be watering
Perfect
I can have watered you can have watered he can have watered we can have watered you can have watered they can have watered
V-ing perfect
I can have been watering you can have been watering he can have been watering we can have been watering you can have been watering they can have been watering
Negation
Simple form
I cannot water you cannot water he cannot water we cannot water you cannot water they cannot water
V-ing form
I cannot be watering you cannot be watering he cannot be watering we cannot be watering you cannot be watering they cannot be watering
Perfect
I cannot have watered you cannot have watered he cannot have watered we cannot have watered you cannot have watered they cannot have watered
V-ing perfect
I cannot have been watering you cannot have been watering he cannot have been watering we cannot have been watering you cannot have been watering they cannot have been watering
Interrogative form
Simple form
can I water? can you water? can he water? can we water? can you water? can they water?
V-ing form
can I be watering? can you be watering? can he be watering? can we be watering? can you be watering? can they be watering?
Perfect
can I have watered? can you have watered? can he have watered? can we have watered? can you have watered? can they have watered?
V-ing perfect
can I have been watering? can you have been watering? can he have been watering? can we have been watering? can you have been watering? can they have been watering?
Interro-negative form
Simple form
can I not water? can you not water? can he not water? can we not water? can you not water? can they not water?
V-ing form
can I not be watering? can you not be watering? can he not be watering? can we not be watering? can you not be watering? can they not be watering?
Perfect
can I not have watered? can you not have watered? can he not have watered? can we not have watered? can you not have watered? can they not have watered?
V-ing perfect
can I not have been watering? can you not have been watering? can he not have been watering? can we not have been watering? can you not have been watering? can they not have been watering?