I must fuck you must fuck she must fuck we must fuck you must fuck they must fuck
V-ing form
I must be fucking you must be fucking she must be fucking we must be fucking you must be fucking they must be fucking
Perfect
I must have fucked you must have fucked she must have fucked we must have fucked you must have fucked they must have fucked
V-ing perfect
I must have been fucking you must have been fucking she must have been fucking we must have been fucking you must have been fucking they must have been fucking
Negation
Simple form
I must not fuck you must not fuck she must not fuck we must not fuck you must not fuck they must not fuck
V-ing form
I must not be fucking you must not be fucking she must not be fucking we must not be fucking you must not be fucking they must not be fucking
Perfect
I must not have fucked you must not have fucked she must not have fucked we must not have fucked you must not have fucked they must not have fucked
V-ing perfect
I must not have been fucking you must not have been fucking she must not have been fucking we must not have been fucking you must not have been fucking they must not have been fucking
Interrogative form
Simple form
must I fuck? must you fuck? must she fuck? must we fuck? must you fuck? must they fuck?
V-ing form
must I be fucking? must you be fucking? must she be fucking? must we be fucking? must you be fucking? must they be fucking?
Perfect
must I have fucked? must you have fucked? must she have fucked? must we have fucked? must you have fucked? must they have fucked?
V-ing perfect
must I have been fucking? must you have been fucking? must she have been fucking? must we have been fucking? must you have been fucking? must they have been fucking?
Interro-negative form
Simple form
must I not fuck? must you not fuck? must she not fuck? must we not fuck? must you not fuck? must they not fuck?
V-ing form
must I not be fucking? must you not be fucking? must she not be fucking? must we not be fucking? must you not be fucking? must they not be fucking?
Perfect
must I not have fucked? must you not have fucked? must she not have fucked? must we not have fucked? must you not have fucked? must they not have fucked?
V-ing perfect
must I not have been fucking? must you not have been fucking? must she not have been fucking? must we not have been fucking? must you not have been fucking? must they not have been fucking?