I must water-cool you must water-cool he must water-cool we must water-cool you must water-cool they must water-cool
V-ing form
I must be water-cooling you must be water-cooling he must be water-cooling we must be water-cooling you must be water-cooling they must be water-cooling
Perfect
I must have water-cooled you must have water-cooled he must have water-cooled we must have water-cooled you must have water-cooled they must have water-cooled
V-ing perfect
I must have been water-cooling you must have been water-cooling he must have been water-cooling we must have been water-cooling you must have been water-cooling they must have been water-cooling
Negation
Simple form
I mustn't water-cool you mustn't water-cool he mustn't water-cool we mustn't water-cool you mustn't water-cool they mustn't water-cool
V-ing form
I mustn't be water-cooling you mustn't be water-cooling he mustn't be water-cooling we mustn't be water-cooling you mustn't be water-cooling they mustn't be water-cooling
Perfect
I mustn't have water-cooled you mustn't have water-cooled he mustn't have water-cooled we mustn't have water-cooled you mustn't have water-cooled they mustn't have water-cooled
V-ing perfect
I mustn't have been water-cooling you mustn't have been water-cooling he mustn't have been water-cooling we mustn't have been water-cooling you mustn't have been water-cooling they mustn't have been water-cooling
Interrogative form
Simple form
must I water-cool? must you water-cool? must he water-cool? must we water-cool? must you water-cool? must they water-cool?
V-ing form
must I be water-cooling? must you be water-cooling? must he be water-cooling? must we be water-cooling? must you be water-cooling? must they be water-cooling?
Perfect
must I have water-cooled? must you have water-cooled? must he have water-cooled? must we have water-cooled? must you have water-cooled? must they have water-cooled?
V-ing perfect
must I have been water-cooling? must you have been water-cooling? must he have been water-cooling? must we have been water-cooling? must you have been water-cooling? must they have been water-cooling?
Interro-negative form
Simple form
mustn't I water-cool? mustn't you water-cool? mustn't he water-cool? mustn't we water-cool? mustn't you water-cool? mustn't they water-cool?
V-ing form
mustn't I be water-cooling? mustn't you be water-cooling? mustn't he be water-cooling? mustn't we be water-cooling? mustn't you be water-cooling? mustn't they be water-cooling?
Perfect
mustn't I have water-cooled? mustn't you have water-cooled? mustn't he have water-cooled? mustn't we have water-cooled? mustn't you have water-cooled? mustn't they have water-cooled?
V-ing perfect
mustn't I have been water-cooling? mustn't you have been water-cooling? mustn't he have been water-cooling? mustn't we have been water-cooling? mustn't you have been water-cooling? mustn't they have been water-cooling?