English verb conjugation
MUST GULL

Regular verb: gull - gulled - gulled

Affirmation

Simple form	V-ing form
I must gull you must gull he must gull we must gull you must gull they must gull	I must be gulling you must be gulling he must be gulling we must be gulling you must be gulling they must be gulling
Perfect	V-ing perfect
I must have gulled you must have gulled he must have gulled we must have gulled you must have gulled they must have gulled	I must have been gulling you must have been gulling he must have been gulling we must have been gulling you must have been gulling they must have been gulling

Negation

Simple form	V-ing form
I mustn't gull you mustn't gull he mustn't gull we mustn't gull you mustn't gull they mustn't gull	I mustn't be gulling you mustn't be gulling he mustn't be gulling we mustn't be gulling you mustn't be gulling they mustn't be gulling
Perfect	V-ing perfect
I mustn't have gulled you mustn't have gulled he mustn't have gulled we mustn't have gulled you mustn't have gulled they mustn't have gulled	I mustn't have been gulling you mustn't have been gulling he mustn't have been gulling we mustn't have been gulling you mustn't have been gulling they mustn't have been gulling

Interrogative form

Simple form	V-ing form
must I gull? must you gull? must he gull? must we gull? must you gull? must they gull?	must I be gulling? must you be gulling? must he be gulling? must we be gulling? must you be gulling? must they be gulling?
Perfect	V-ing perfect
must I have gulled? must you have gulled? must he have gulled? must we have gulled? must you have gulled? must they have gulled?	must I have been gulling? must you have been gulling? must he have been gulling? must we have been gulling? must you have been gulling? must they have been gulling?

Interro-negative form

Simple form	V-ing form
mustn't I gull? mustn't you gull? mustn't he gull? mustn't we gull? mustn't you gull? mustn't they gull?	mustn't I be gulling? mustn't you be gulling? mustn't he be gulling? mustn't we be gulling? mustn't you be gulling? mustn't they be gulling?
Perfect	V-ing perfect
mustn't I have gulled? mustn't you have gulled? mustn't he have gulled? mustn't we have gulled? mustn't you have gulled? mustn't they have gulled?	mustn't I have been gulling? mustn't you have been gulling? mustn't he have been gulling? mustn't we have been gulling? mustn't you have been gulling? mustn't they have been gulling?