I must flatter you must flatter he must flatter we must flatter you must flatter they must flatter
V-ing form
I must be flattering you must be flattering he must be flattering we must be flattering you must be flattering they must be flattering
Perfect
I must have flattered you must have flattered he must have flattered we must have flattered you must have flattered they must have flattered
V-ing perfect
I must have been flattering you must have been flattering he must have been flattering we must have been flattering you must have been flattering they must have been flattering
Negation
Simple form
I mustn't flatter you mustn't flatter he mustn't flatter we mustn't flatter you mustn't flatter they mustn't flatter
V-ing form
I mustn't be flattering you mustn't be flattering he mustn't be flattering we mustn't be flattering you mustn't be flattering they mustn't be flattering
Perfect
I mustn't have flattered you mustn't have flattered he mustn't have flattered we mustn't have flattered you mustn't have flattered they mustn't have flattered
V-ing perfect
I mustn't have been flattering you mustn't have been flattering he mustn't have been flattering we mustn't have been flattering you mustn't have been flattering they mustn't have been flattering
Interrogative form
Simple form
must I flatter? must you flatter? must he flatter? must we flatter? must you flatter? must they flatter?
V-ing form
must I be flattering? must you be flattering? must he be flattering? must we be flattering? must you be flattering? must they be flattering?
Perfect
must I have flattered? must you have flattered? must he have flattered? must we have flattered? must you have flattered? must they have flattered?
V-ing perfect
must I have been flattering? must you have been flattering? must he have been flattering? must we have been flattering? must you have been flattering? must they have been flattering?
Interro-negative form
Simple form
mustn't I flatter? mustn't you flatter? mustn't he flatter? mustn't we flatter? mustn't you flatter? mustn't they flatter?
V-ing form
mustn't I be flattering? mustn't you be flattering? mustn't he be flattering? mustn't we be flattering? mustn't you be flattering? mustn't they be flattering?
Perfect
mustn't I have flattered? mustn't you have flattered? mustn't he have flattered? mustn't we have flattered? mustn't you have flattered? mustn't they have flattered?
V-ing perfect
mustn't I have been flattering? mustn't you have been flattering? mustn't he have been flattering? mustn't we have been flattering? mustn't you have been flattering? mustn't they have been flattering?