must presharpen
Regular verb: presharpen - presharpened- presharpened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must presharpen
you must presharpen
he must presharpen
we must presharpen
you must presharpen
they must presharpen 	I must be presharpening
you must be presharpening
he must be presharpening
we must be presharpening
you must be presharpening
they must be presharpening	I must have presharpened
you must have presharpened
he must have presharpened
we must have presharpened
you must have presharpened
they must have presharpened	I must have been presharpening
you must have been presharpening
he must have been presharpening
we must have been presharpening
you must have been presharpening
they must have been presharpening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't presharpen
you mustn't presharpen
he mustn't presharpen
we mustn't presharpen
you mustn't presharpen
they mustn't presharpen 	I mustn't be presharpening
you mustn't be presharpening
he mustn't be presharpening
we mustn't be presharpening
you mustn't be presharpening
they mustn't be presharpening	I mustn't have presharpened
you mustn't have presharpened
he mustn't have presharpened
we mustn't have presharpened
you mustn't have presharpened
they mustn't have presharpened	I mustn't have been presharpening
you mustn't have been presharpening
he mustn't have been presharpening
we mustn't have been presharpening
you mustn't have been presharpening
they mustn't have been presharpening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I presharpen?
must you presharpen?
must he presharpen?
must we presharpen?
must you presharpen?
must they presharpen? 	must I be presharpening?
must you be presharpening?
must he be presharpening?
must we be presharpening?
must you be presharpening?
must they be presharpening? 	must I have presharpened?
must you have presharpened?
must he have presharpened?
must we have presharpened?
must you have presharpened?
must they have presharpened? 	must I have been presharpening?
must you have been presharpening?
must he have been presharpening?
must we have been presharpening?
must you have been presharpening?
must they have been presharpening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I presharpen?
mustn't you presharpen?
mustn't he presharpen?
mustn't we presharpen?
mustn't you presharpen?
mustn't they presharpen? 	mustn't I be presharpening?
mustn't you be presharpening?
mustn't he be presharpening?
mustn't we be presharpening?
mustn't you be presharpening?
mustn't they be presharpening? 	mustn't I have presharpened?
mustn't you have presharpened?
mustn't he have presharpened?
mustn't we have presharpened?
mustn't you have presharpened?
mustn't they have presharpened? 	mustn't I have been presharpening?
mustn't you have been presharpening?
mustn't he have been presharpening?
mustn't we have been presharpening?
mustn't you have been presharpening?
mustn't they have been presharpening?