could presharpen
Regular verb: presharpen - presharpened- presharpened

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not presharpen
you could not presharpen
he could not presharpen
we could not presharpen
you could not presharpen
they could not presharpen 	I could not be presharpening
you could not be presharpening
he could not be presharpening
we could not be presharpening
you could not be presharpening
they could not be presharpening	I could not have presharpened
you could not have presharpened
he could not have presharpened
we could not have presharpened
you could not have presharpened
they could not have presharpened	I could not have been presharpening
you could not have been presharpening
he could not have been presharpening
we could not have been presharpening
you could not have been presharpening
they could not have been presharpening	

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

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