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