must unhorse
Regular verb: unhorse - unhorsed- unhorsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unhorse
you must unhorse
he must unhorse
we must unhorse
you must unhorse
they must unhorse 	I must be unhorsing
you must be unhorsing
he must be unhorsing
we must be unhorsing
you must be unhorsing
they must be unhorsing	I must have unhorsed
you must have unhorsed
he must have unhorsed
we must have unhorsed
you must have unhorsed
they must have unhorsed	I must have been unhorsing
you must have been unhorsing
he must have been unhorsing
we must have been unhorsing
you must have been unhorsing
they must have been unhorsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't unhorse
you mustn't unhorse
he mustn't unhorse
we mustn't unhorse
you mustn't unhorse
they mustn't unhorse 	I mustn't be unhorsing
you mustn't be unhorsing
he mustn't be unhorsing
we mustn't be unhorsing
you mustn't be unhorsing
they mustn't be unhorsing	I mustn't have unhorsed
you mustn't have unhorsed
he mustn't have unhorsed
we mustn't have unhorsed
you mustn't have unhorsed
they mustn't have unhorsed	I mustn't have been unhorsing
you mustn't have been unhorsing
he mustn't have been unhorsing
we mustn't have been unhorsing
you mustn't have been unhorsing
they mustn't have been unhorsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unhorse?
must you unhorse?
must he unhorse?
must we unhorse?
must you unhorse?
must they unhorse? 	must I be unhorsing?
must you be unhorsing?
must he be unhorsing?
must we be unhorsing?
must you be unhorsing?
must they be unhorsing? 	must I have unhorsed?
must you have unhorsed?
must he have unhorsed?
must we have unhorsed?
must you have unhorsed?
must they have unhorsed? 	must I have been unhorsing?
must you have been unhorsing?
must he have been unhorsing?
must we have been unhorsing?
must you have been unhorsing?
must they have been unhorsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I unhorse?
mustn't you unhorse?
mustn't he unhorse?
mustn't we unhorse?
mustn't you unhorse?
mustn't they unhorse? 	mustn't I be unhorsing?
mustn't you be unhorsing?
mustn't he be unhorsing?
mustn't we be unhorsing?
mustn't you be unhorsing?
mustn't they be unhorsing? 	mustn't I have unhorsed?
mustn't you have unhorsed?
mustn't he have unhorsed?
mustn't we have unhorsed?
mustn't you have unhorsed?
mustn't they have unhorsed? 	mustn't I have been unhorsing?
mustn't you have been unhorsing?
mustn't he have been unhorsing?
mustn't we have been unhorsing?
mustn't you have been unhorsing?
mustn't they have been unhorsing?