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