I must cheat you must cheat she must cheat we must cheat you must cheat they must cheat
V-ing form
I must be cheating you must be cheating she must be cheating we must be cheating you must be cheating they must be cheating
Perfect
I must have cheated you must have cheated she must have cheated we must have cheated you must have cheated they must have cheated
V-ing perfect
I must have been cheating you must have been cheating she must have been cheating we must have been cheating you must have been cheating they must have been cheating
Negation
Simple form
I must not cheat you must not cheat she must not cheat we must not cheat you must not cheat they must not cheat
V-ing form
I must not be cheating you must not be cheating she must not be cheating we must not be cheating you must not be cheating they must not be cheating
Perfect
I must not have cheated you must not have cheated she must not have cheated we must not have cheated you must not have cheated they must not have cheated
V-ing perfect
I must not have been cheating you must not have been cheating she must not have been cheating we must not have been cheating you must not have been cheating they must not have been cheating
Interrogative form
Simple form
must I cheat? must you cheat? must she cheat? must we cheat? must you cheat? must they cheat?
V-ing form
must I be cheating? must you be cheating? must she be cheating? must we be cheating? must you be cheating? must they be cheating?
Perfect
must I have cheated? must you have cheated? must she have cheated? must we have cheated? must you have cheated? must they have cheated?
V-ing perfect
must I have been cheating? must you have been cheating? must she have been cheating? must we have been cheating? must you have been cheating? must they have been cheating?
Interro-negative form
Simple form
must I not cheat? must you not cheat? must she not cheat? must we not cheat? must you not cheat? must they not cheat?
V-ing form
must I not be cheating? must you not be cheating? must she not be cheating? must we not be cheating? must you not be cheating? must they not be cheating?
Perfect
must I not have cheated? must you not have cheated? must she not have cheated? must we not have cheated? must you not have cheated? must they not have cheated?
V-ing perfect
must I not have been cheating? must you not have been cheating? must she not have been cheating? must we not have been cheating? must you not have been cheating? must they not have been cheating?