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 can't water you can't water he can't water we can't water you can't water they can't water
V-ing form
I can't be watering you can't be watering he can't be watering we can't be watering you can't be watering they can't be watering
Perfect
I can't have watered you can't have watered he can't have watered we can't have watered you can't have watered they can't have watered
V-ing perfect
I can't have been watering you can't have been watering he can't have been watering we can't have been watering you can't have been watering they can't 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't I water? can't you water? can't he water? can't we water? can't you water? can't they water?
V-ing form
can't I be watering? can't you be watering? can't he be watering? can't we be watering? can't you be watering? can't they be watering?
Perfect
can't I have watered? can't you have watered? can't he have watered? can't we have watered? can't you have watered? can't they have watered?
V-ing perfect
can't I have been watering? can't you have been watering? can't he have been watering? can't we have been watering? can't you have been watering? can't they have been watering?