English verb conjugation
MUST GULP

Regular verb: gulp - gulped - gulped

Affirmation

Simple form	V-ing form
I must gulp you must gulp he must gulp we must gulp you must gulp they must gulp	I must be gulping you must be gulping he must be gulping we must be gulping you must be gulping they must be gulping
Perfect	V-ing perfect
I must have gulped you must have gulped he must have gulped we must have gulped you must have gulped they must have gulped	I must have been gulping you must have been gulping he must have been gulping we must have been gulping you must have been gulping they must have been gulping

Negation

Simple form	V-ing form
I mustn't gulp you mustn't gulp he mustn't gulp we mustn't gulp you mustn't gulp they mustn't gulp	I mustn't be gulping you mustn't be gulping he mustn't be gulping we mustn't be gulping you mustn't be gulping they mustn't be gulping
Perfect	V-ing perfect
I mustn't have gulped you mustn't have gulped he mustn't have gulped we mustn't have gulped you mustn't have gulped they mustn't have gulped	I mustn't have been gulping you mustn't have been gulping he mustn't have been gulping we mustn't have been gulping you mustn't have been gulping they mustn't have been gulping

Interrogative form

Simple form	V-ing form
must I gulp? must you gulp? must he gulp? must we gulp? must you gulp? must they gulp?	must I be gulping? must you be gulping? must he be gulping? must we be gulping? must you be gulping? must they be gulping?
Perfect	V-ing perfect
must I have gulped? must you have gulped? must he have gulped? must we have gulped? must you have gulped? must they have gulped?	must I have been gulping? must you have been gulping? must he have been gulping? must we have been gulping? must you have been gulping? must they have been gulping?

Interro-negative form

Simple form	V-ing form
mustn't I gulp? mustn't you gulp? mustn't he gulp? mustn't we gulp? mustn't you gulp? mustn't they gulp?	mustn't I be gulping? mustn't you be gulping? mustn't he be gulping? mustn't we be gulping? mustn't you be gulping? mustn't they be gulping?
Perfect	V-ing perfect
mustn't I have gulped? mustn't you have gulped? mustn't he have gulped? mustn't we have gulped? mustn't you have gulped? mustn't they have gulped?	mustn't I have been gulping? mustn't you have been gulping? mustn't he have been gulping? mustn't we have been gulping? mustn't you have been gulping? mustn't they have been gulping?