I must trot you must trot she must trot we must trot you must trot they must trot
V-ing form
I must be trotting you must be trotting she must be trotting we must be trotting you must be trotting they must be trotting
Perfect
I must have trotted you must have trotted she must have trotted we must have trotted you must have trotted they must have trotted
V-ing perfect
I must have been trotting you must have been trotting she must have been trotting we must have been trotting you must have been trotting they must have been trotting
Negation
Simple form
I must not trot you must not trot she must not trot we must not trot you must not trot they must not trot
V-ing form
I must not be trotting you must not be trotting she must not be trotting we must not be trotting you must not be trotting they must not be trotting
Perfect
I must not have trotted you must not have trotted she must not have trotted we must not have trotted you must not have trotted they must not have trotted
V-ing perfect
I must not have been trotting you must not have been trotting she must not have been trotting we must not have been trotting you must not have been trotting they must not have been trotting
Interrogative form
Simple form
must I trot? must you trot? must she trot? must we trot? must you trot? must they trot?
V-ing form
must I be trotting? must you be trotting? must she be trotting? must we be trotting? must you be trotting? must they be trotting?
Perfect
must I have trotted? must you have trotted? must she have trotted? must we have trotted? must you have trotted? must they have trotted?
V-ing perfect
must I have been trotting? must you have been trotting? must she have been trotting? must we have been trotting? must you have been trotting? must they have been trotting?
Interro-negative form
Simple form
must I not trot? must you not trot? must she not trot? must we not trot? must you not trot? must they not trot?
V-ing form
must I not be trotting? must you not be trotting? must she not be trotting? must we not be trotting? must you not be trotting? must they not be trotting?
Perfect
must I not have trotted? must you not have trotted? must she not have trotted? must we not have trotted? must you not have trotted? must they not have trotted?
V-ing perfect
must I not have been trotting? must you not have been trotting? must she not have been trotting? must we not have been trotting? must you not have been trotting? must they not have been trotting?