must sheer
Regular verb: sheer - sheered- sheered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sheer
you must sheer
she must sheer
we must sheer
you must sheer
they must sheer 	I must be sheering
you must be sheering
she must be sheering
we must be sheering
you must be sheering
they must be sheering	I must have sheered
you must have sheered
she must have sheered
we must have sheered
you must have sheered
they must have sheered	I must have been sheering
you must have been sheering
she must have been sheering
we must have been sheering
you must have been sheering
they must have been sheering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sheer
you mustn't sheer
she mustn't sheer
we mustn't sheer
you mustn't sheer
they mustn't sheer 	I mustn't be sheering
you mustn't be sheering
she mustn't be sheering
we mustn't be sheering
you mustn't be sheering
they mustn't be sheering	I mustn't have sheered
you mustn't have sheered
she mustn't have sheered
we mustn't have sheered
you mustn't have sheered
they mustn't have sheered	I mustn't have been sheering
you mustn't have been sheering
she mustn't have been sheering
we mustn't have been sheering
you mustn't have been sheering
they mustn't have been sheering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sheer?
must you sheer?
must she sheer?
must we sheer?
must you sheer?
must they sheer? 	must I be sheering?
must you be sheering?
must she be sheering?
must we be sheering?
must you be sheering?
must they be sheering? 	must I have sheered?
must you have sheered?
must she have sheered?
must we have sheered?
must you have sheered?
must they have sheered? 	must I have been sheering?
must you have been sheering?
must she have been sheering?
must we have been sheering?
must you have been sheering?
must they have been sheering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sheer?
mustn't you sheer?
mustn't she sheer?
mustn't we sheer?
mustn't you sheer?
mustn't they sheer? 	mustn't I be sheering?
mustn't you be sheering?
mustn't she be sheering?
mustn't we be sheering?
mustn't you be sheering?
mustn't they be sheering? 	mustn't I have sheered?
mustn't you have sheered?
mustn't she have sheered?
mustn't we have sheered?
mustn't you have sheered?
mustn't they have sheered? 	mustn't I have been sheering?
mustn't you have been sheering?
mustn't she have been sheering?
mustn't we have been sheering?
mustn't you have been sheering?
mustn't they have been sheering?