I must modulate you must modulate he must modulate we must modulate you must modulate they must modulate
V-ing form
I must be modulating you must be modulating he must be modulating we must be modulating you must be modulating they must be modulating
Perfect
I must have modulated you must have modulated he must have modulated we must have modulated you must have modulated they must have modulated
V-ing perfect
I must have been modulating you must have been modulating he must have been modulating we must have been modulating you must have been modulating they must have been modulating
Negation
Simple form
I must not modulate you must not modulate he must not modulate we must not modulate you must not modulate they must not modulate
V-ing form
I must not be modulating you must not be modulating he must not be modulating we must not be modulating you must not be modulating they must not be modulating
Perfect
I must not have modulated you must not have modulated he must not have modulated we must not have modulated you must not have modulated they must not have modulated
V-ing perfect
I must not have been modulating you must not have been modulating he must not have been modulating we must not have been modulating you must not have been modulating they must not have been modulating
Interrogative form
Simple form
must I modulate? must you modulate? must he modulate? must we modulate? must you modulate? must they modulate?
V-ing form
must I be modulating? must you be modulating? must he be modulating? must we be modulating? must you be modulating? must they be modulating?
Perfect
must I have modulated? must you have modulated? must he have modulated? must we have modulated? must you have modulated? must they have modulated?
V-ing perfect
must I have been modulating? must you have been modulating? must he have been modulating? must we have been modulating? must you have been modulating? must they have been modulating?
Interro-negative form
Simple form
must I not modulate? must you not modulate? must he not modulate? must we not modulate? must you not modulate? must they not modulate?
V-ing form
must I not be modulating? must you not be modulating? must he not be modulating? must we not be modulating? must you not be modulating? must they not be modulating?
Perfect
must I not have modulated? must you not have modulated? must he not have modulated? must we not have modulated? must you not have modulated? must they not have modulated?
V-ing perfect
must I not have been modulating? must you not have been modulating? must he not have been modulating? must we not have been modulating? must you not have been modulating? must they not have been modulating?