Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must fuck fuck you must fuck fuck she must fuck fuck we must fuck fuck you must fuck fuck they must fuck fuck
V-ing form
I must be fuck fucking you must be fuck fucking she must be fuck fucking we must be fuck fucking you must be fuck fucking they must be fuck fucking
Perfect
I must have fuck fucked you must have fuck fucked she must have fuck fucked we must have fuck fucked you must have fuck fucked they must have fuck fucked
V-ing perfect
I must have been fuck fucking you must have been fuck fucking she must have been fuck fucking we must have been fuck fucking you must have been fuck fucking they must have been fuck fucking
Negation
Simple form
I mustn't fuck fuck you mustn't fuck fuck she mustn't fuck fuck we mustn't fuck fuck you mustn't fuck fuck they mustn't fuck fuck
V-ing form
I mustn't be fuck fucking you mustn't be fuck fucking she mustn't be fuck fucking we mustn't be fuck fucking you mustn't be fuck fucking they mustn't be fuck fucking
Perfect
I mustn't have fuck fucked you mustn't have fuck fucked she mustn't have fuck fucked we mustn't have fuck fucked you mustn't have fuck fucked they mustn't have fuck fucked
V-ing perfect
I mustn't have been fuck fucking you mustn't have been fuck fucking she mustn't have been fuck fucking we mustn't have been fuck fucking you mustn't have been fuck fucking they mustn't have been fuck fucking
Interrogative form
Simple form
must I fuck fuck? must you fuck fuck? must she fuck fuck? must we fuck fuck? must you fuck fuck? must they fuck fuck?
V-ing form
must I be fuck fucking? must you be fuck fucking? must she be fuck fucking? must we be fuck fucking? must you be fuck fucking? must they be fuck fucking?
Perfect
must I have fuck fucked? must you have fuck fucked? must she have fuck fucked? must we have fuck fucked? must you have fuck fucked? must they have fuck fucked?
V-ing perfect
must I have been fuck fucking? must you have been fuck fucking? must she have been fuck fucking? must we have been fuck fucking? must you have been fuck fucking? must they have been fuck fucking?
Interro-negative form
Simple form
mustn't I fuck fuck? mustn't you fuck fuck? mustn't she fuck fuck? mustn't we fuck fuck? mustn't you fuck fuck? mustn't they fuck fuck?
V-ing form
mustn't I be fuck fucking? mustn't you be fuck fucking? mustn't she be fuck fucking? mustn't we be fuck fucking? mustn't you be fuck fucking? mustn't they be fuck fucking?
Perfect
mustn't I have fuck fucked? mustn't you have fuck fucked? mustn't she have fuck fucked? mustn't we have fuck fucked? mustn't you have fuck fucked? mustn't they have fuck fucked?
V-ing perfect
mustn't I have been fuck fucking? mustn't you have been fuck fucking? mustn't she have been fuck fucking? mustn't we have been fuck fucking? mustn't you have been fuck fucking? mustn't they have been fuck fucking?