must baa
Regular verb: baa - baaed- baaed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must baa
you must baa
she must baa
we must baa
you must baa
they must baa 	I must be baaing
you must be baaing
she must be baaing
we must be baaing
you must be baaing
they must be baaing	I must have baaed
you must have baaed
she must have baaed
we must have baaed
you must have baaed
they must have baaed	I must have been baaing
you must have been baaing
she must have been baaing
we must have been baaing
you must have been baaing
they must have been baaing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't baa
you mustn't baa
she mustn't baa
we mustn't baa
you mustn't baa
they mustn't baa 	I mustn't be baaing
you mustn't be baaing
she mustn't be baaing
we mustn't be baaing
you mustn't be baaing
they mustn't be baaing	I mustn't have baaed
you mustn't have baaed
she mustn't have baaed
we mustn't have baaed
you mustn't have baaed
they mustn't have baaed	I mustn't have been baaing
you mustn't have been baaing
she mustn't have been baaing
we mustn't have been baaing
you mustn't have been baaing
they mustn't have been baaing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I baa?
must you baa?
must she baa?
must we baa?
must you baa?
must they baa? 	must I be baaing?
must you be baaing?
must she be baaing?
must we be baaing?
must you be baaing?
must they be baaing? 	must I have baaed?
must you have baaed?
must she have baaed?
must we have baaed?
must you have baaed?
must they have baaed? 	must I have been baaing?
must you have been baaing?
must she have been baaing?
must we have been baaing?
must you have been baaing?
must they have been baaing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I baa?
mustn't you baa?
mustn't she baa?
mustn't we baa?
mustn't you baa?
mustn't they baa? 	mustn't I be baaing?
mustn't you be baaing?
mustn't she be baaing?
mustn't we be baaing?
mustn't you be baaing?
mustn't they be baaing? 	mustn't I have baaed?
mustn't you have baaed?
mustn't she have baaed?
mustn't we have baaed?
mustn't you have baaed?
mustn't they have baaed? 	mustn't I have been baaing?
mustn't you have been baaing?
mustn't she have been baaing?
mustn't we have been baaing?
mustn't you have been baaing?
mustn't they have been baaing?