English verb conjugation
MUST GAB

Regular verb: gab - gabbed - gabbed

Affirmation

Simple form	V-ing form
I must gab you must gab she must gab we must gab you must gab they must gab	I must be gabbing you must be gabbing she must be gabbing we must be gabbing you must be gabbing they must be gabbing
Perfect	V-ing perfect
I must have gabbed you must have gabbed she must have gabbed we must have gabbed you must have gabbed they must have gabbed	I must have been gabbing you must have been gabbing she must have been gabbing we must have been gabbing you must have been gabbing they must have been gabbing

Negation

Simple form	V-ing form
I mustn't gab you mustn't gab she mustn't gab we mustn't gab you mustn't gab they mustn't gab	I mustn't be gabbing you mustn't be gabbing she mustn't be gabbing we mustn't be gabbing you mustn't be gabbing they mustn't be gabbing
Perfect	V-ing perfect
I mustn't have gabbed you mustn't have gabbed she mustn't have gabbed we mustn't have gabbed you mustn't have gabbed they mustn't have gabbed	I mustn't have been gabbing you mustn't have been gabbing she mustn't have been gabbing we mustn't have been gabbing you mustn't have been gabbing they mustn't have been gabbing

Interrogative form

Simple form	V-ing form
must I gab? must you gab? must she gab? must we gab? must you gab? must they gab?	must I be gabbing? must you be gabbing? must she be gabbing? must we be gabbing? must you be gabbing? must they be gabbing?
Perfect	V-ing perfect
must I have gabbed? must you have gabbed? must she have gabbed? must we have gabbed? must you have gabbed? must they have gabbed?	must I have been gabbing? must you have been gabbing? must she have been gabbing? must we have been gabbing? must you have been gabbing? must they have been gabbing?

Interro-negative form

Simple form	V-ing form
mustn't I gab? mustn't you gab? mustn't she gab? mustn't we gab? mustn't you gab? mustn't they gab?	mustn't I be gabbing? mustn't you be gabbing? mustn't she be gabbing? mustn't we be gabbing? mustn't you be gabbing? mustn't they be gabbing?
Perfect	V-ing perfect
mustn't I have gabbed? mustn't you have gabbed? mustn't she have gabbed? mustn't we have gabbed? mustn't you have gabbed? mustn't they have gabbed?	mustn't I have been gabbing? mustn't you have been gabbing? mustn't she have been gabbing? mustn't we have been gabbing? mustn't you have been gabbing? mustn't they have been gabbing?