I must fan you must fan she must fan we must fan you must fan they must fan
V-ing form
I must be fanning you must be fanning she must be fanning we must be fanning you must be fanning they must be fanning
Perfect
I must have fanned you must have fanned she must have fanned we must have fanned you must have fanned they must have fanned
V-ing perfect
I must have been fanning you must have been fanning she must have been fanning we must have been fanning you must have been fanning they must have been fanning
Negation
Simple form
I mustn't fan you mustn't fan she mustn't fan we mustn't fan you mustn't fan they mustn't fan
V-ing form
I mustn't be fanning you mustn't be fanning she mustn't be fanning we mustn't be fanning you mustn't be fanning they mustn't be fanning
Perfect
I mustn't have fanned you mustn't have fanned she mustn't have fanned we mustn't have fanned you mustn't have fanned they mustn't have fanned
V-ing perfect
I mustn't have been fanning you mustn't have been fanning she mustn't have been fanning we mustn't have been fanning you mustn't have been fanning they mustn't have been fanning
Interrogative form
Simple form
must I fan? must you fan? must she fan? must we fan? must you fan? must they fan?
V-ing form
must I be fanning? must you be fanning? must she be fanning? must we be fanning? must you be fanning? must they be fanning?
Perfect
must I have fanned? must you have fanned? must she have fanned? must we have fanned? must you have fanned? must they have fanned?
V-ing perfect
must I have been fanning? must you have been fanning? must she have been fanning? must we have been fanning? must you have been fanning? must they have been fanning?
Interro-negative form
Simple form
mustn't I fan? mustn't you fan? mustn't she fan? mustn't we fan? mustn't you fan? mustn't they fan?
V-ing form
mustn't I be fanning? mustn't you be fanning? mustn't she be fanning? mustn't we be fanning? mustn't you be fanning? mustn't they be fanning?
Perfect
mustn't I have fanned? mustn't you have fanned? mustn't she have fanned? mustn't we have fanned? mustn't you have fanned? mustn't they have fanned?
V-ing perfect
mustn't I have been fanning? mustn't you have been fanning? mustn't she have been fanning? mustn't we have been fanning? mustn't you have been fanning? mustn't they have been fanning?