English verb conjugation
CAN PRESHARPEN

Regular verb: presharpen - presharpened - presharpened

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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