English verb conjugation
COULD PRESHARPEN

Regular verb: presharpen - presharpened - presharpened

Affirmation

Simple form	V-ing form
I could presharpen you could presharpen she could presharpen we could presharpen you could presharpen they could presharpen	I could be presharpening you could be presharpening she 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 she 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 she 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 couldn't presharpen you couldn't presharpen she couldn't presharpen we couldn't presharpen you couldn't presharpen they couldn't presharpen	I couldn't be presharpening you couldn't be presharpening she couldn't be presharpening we couldn't be presharpening you couldn't be presharpening they couldn't be presharpening
Perfect	V-ing perfect
I couldn't have presharpened you couldn't have presharpened she couldn't have presharpened we couldn't have presharpened you couldn't have presharpened they couldn't have presharpened	I couldn't have been presharpening you couldn't have been presharpening she couldn't have been presharpening we couldn't have been presharpening you couldn't have been presharpening they couldn't have been presharpening

Interrogative form

Simple form	V-ing form
could I presharpen? could you presharpen? could she presharpen? could we presharpen? could you presharpen? could they presharpen?	could I be presharpening? could you be presharpening? could she 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 she 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 she 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
couldn't I presharpen? couldn't you presharpen? couldn't she presharpen? couldn't we presharpen? couldn't you presharpen? couldn't they presharpen?	couldn't I be presharpening? couldn't you be presharpening? couldn't she be presharpening? couldn't we be presharpening? couldn't you be presharpening? couldn't they be presharpening?
Perfect	V-ing perfect
couldn't I have presharpened? couldn't you have presharpened? couldn't she have presharpened? couldn't we have presharpened? couldn't you have presharpened? couldn't they have presharpened?	couldn't I have been presharpening? couldn't you have been presharpening? couldn't she have been presharpening? couldn't we have been presharpening? couldn't you have been presharpening? couldn't they have been presharpening?