must hee-haw
Regular verb: hee-haw - hee-hawed- hee-hawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must hee-haw
you must hee-haw
she must hee-haw
we must hee-haw
you must hee-haw
they must hee-haw 	I must be hee-hawing
you must be hee-hawing
she must be hee-hawing
we must be hee-hawing
you must be hee-hawing
they must be hee-hawing	I must have hee-hawed
you must have hee-hawed
she must have hee-hawed
we must have hee-hawed
you must have hee-hawed
they must have hee-hawed	I must have been hee-hawing
you must have been hee-hawing
she must have been hee-hawing
we must have been hee-hawing
you must have been hee-hawing
they must have been hee-hawing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't hee-haw
you mustn't hee-haw
she mustn't hee-haw
we mustn't hee-haw
you mustn't hee-haw
they mustn't hee-haw 	I mustn't be hee-hawing
you mustn't be hee-hawing
she mustn't be hee-hawing
we mustn't be hee-hawing
you mustn't be hee-hawing
they mustn't be hee-hawing	I mustn't have hee-hawed
you mustn't have hee-hawed
she mustn't have hee-hawed
we mustn't have hee-hawed
you mustn't have hee-hawed
they mustn't have hee-hawed	I mustn't have been hee-hawing
you mustn't have been hee-hawing
she mustn't have been hee-hawing
we mustn't have been hee-hawing
you mustn't have been hee-hawing
they mustn't have been hee-hawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I hee-haw?
must you hee-haw?
must she hee-haw?
must we hee-haw?
must you hee-haw?
must they hee-haw? 	must I be hee-hawing?
must you be hee-hawing?
must she be hee-hawing?
must we be hee-hawing?
must you be hee-hawing?
must they be hee-hawing? 	must I have hee-hawed?
must you have hee-hawed?
must she have hee-hawed?
must we have hee-hawed?
must you have hee-hawed?
must they have hee-hawed? 	must I have been hee-hawing?
must you have been hee-hawing?
must she have been hee-hawing?
must we have been hee-hawing?
must you have been hee-hawing?
must they have been hee-hawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I hee-haw?
mustn't you hee-haw?
mustn't she hee-haw?
mustn't we hee-haw?
mustn't you hee-haw?
mustn't they hee-haw? 	mustn't I be hee-hawing?
mustn't you be hee-hawing?
mustn't she be hee-hawing?
mustn't we be hee-hawing?
mustn't you be hee-hawing?
mustn't they be hee-hawing? 	mustn't I have hee-hawed?
mustn't you have hee-hawed?
mustn't she have hee-hawed?
mustn't we have hee-hawed?
mustn't you have hee-hawed?
mustn't they have hee-hawed? 	mustn't I have been hee-hawing?
mustn't you have been hee-hawing?
mustn't she have been hee-hawing?
mustn't we have been hee-hawing?
mustn't you have been hee-hawing?
mustn't they have been hee-hawing?