must babble
Regular verb: babble - babbled- babbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must babble
you must babble
she must babble
we must babble
you must babble
they must babble 	I must be babbling
you must be babbling
she must be babbling
we must be babbling
you must be babbling
they must be babbling	I must have babbled
you must have babbled
she must have babbled
we must have babbled
you must have babbled
they must have babbled	I must have been babbling
you must have been babbling
she must have been babbling
we must have been babbling
you must have been babbling
they must have been babbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't babble
you mustn't babble
she mustn't babble
we mustn't babble
you mustn't babble
they mustn't babble 	I mustn't be babbling
you mustn't be babbling
she mustn't be babbling
we mustn't be babbling
you mustn't be babbling
they mustn't be babbling	I mustn't have babbled
you mustn't have babbled
she mustn't have babbled
we mustn't have babbled
you mustn't have babbled
they mustn't have babbled	I mustn't have been babbling
you mustn't have been babbling
she mustn't have been babbling
we mustn't have been babbling
you mustn't have been babbling
they mustn't have been babbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I babble?
must you babble?
must she babble?
must we babble?
must you babble?
must they babble? 	must I be babbling?
must you be babbling?
must she be babbling?
must we be babbling?
must you be babbling?
must they be babbling? 	must I have babbled?
must you have babbled?
must she have babbled?
must we have babbled?
must you have babbled?
must they have babbled? 	must I have been babbling?
must you have been babbling?
must she have been babbling?
must we have been babbling?
must you have been babbling?
must they have been babbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I babble?
mustn't you babble?
mustn't she babble?
mustn't we babble?
mustn't you babble?
mustn't they babble? 	mustn't I be babbling?
mustn't you be babbling?
mustn't she be babbling?
mustn't we be babbling?
mustn't you be babbling?
mustn't they be babbling? 	mustn't I have babbled?
mustn't you have babbled?
mustn't she have babbled?
mustn't we have babbled?
mustn't you have babbled?
mustn't they have babbled? 	mustn't I have been babbling?
mustn't you have been babbling?
mustn't she have been babbling?
mustn't we have been babbling?
mustn't you have been babbling?
mustn't they have been babbling?