English verb conjugation
COULD PRESHARPEN

Regular verb: presharpen - presharpened - presharpened

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?