I must flatter you must flatter she must flatter we must flatter you must flatter they must flatter
V-ing form
I must be flattering you must be flattering she must be flattering we must be flattering you must be flattering they must be flattering
Perfect
I must have flattered you must have flattered she 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 she 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 she 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 she 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 she 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 she 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 she flatter? must we flatter? must you flatter? must they flatter?
V-ing form
must I be flattering? must you be flattering? must she be flattering? must we be flattering? must you be flattering? must they be flattering?
Perfect
must I have flattered? must you have flattered? must she 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 she 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 she 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 she 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 she 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 she have been flattering? mustn't we have been flattering? mustn't you have been flattering? mustn't they have been flattering?