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