must gab
Regular verb: gab - gabbed- gabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I must not gab
you must not gab
she must not gab
we must not gab
you must not gab
they must not gab 	I must not be gabbing
you must not be gabbing
she must not be gabbing
we must not be gabbing
you must not be gabbing
they must not be gabbing	I must not have gabbed
you must not have gabbed
she must not have gabbed
we must not have gabbed
you must not have gabbed
they must not have gabbed	I must not have been gabbing
you must not have been gabbing
she must not have been gabbing
we must not have been gabbing
you must not have been gabbing
they must not have been gabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
must I not gab?
must you not gab?
must she not gab?
must we not gab?
must you not gab?
must they not gab? 	must I not be gabbing?
must you not be gabbing?
must she not be gabbing?
must we not be gabbing?
must you not be gabbing?
must they not be gabbing? 	must I not have gabbed?
must you not have gabbed?
must she not have gabbed?
must we not have gabbed?
must you not have gabbed?
must they not have gabbed? 	must I not have been gabbing?
must you not have been gabbing?
must she not have been gabbing?
must we not have been gabbing?
must you not have been gabbing?
must they not have been gabbing?