English verb conjugation
CAN PREHARDEN

Regular verb: preharden - prehardened - prehardened

Affirmation

Simple form	V-ing form
I can preharden you can preharden he can preharden we can preharden you can preharden they can preharden	I can be prehardening you can be prehardening he can be prehardening we can be prehardening you can be prehardening they can be prehardening
Perfect	V-ing perfect
I can have prehardened you can have prehardened he can have prehardened we can have prehardened you can have prehardened they can have prehardened	I can have been prehardening you can have been prehardening he can have been prehardening we can have been prehardening you can have been prehardening they can have been prehardening

Negation

Simple form	V-ing form
I cannot preharden you cannot preharden he cannot preharden we cannot preharden you cannot preharden they cannot preharden	I cannot be prehardening you cannot be prehardening he cannot be prehardening we cannot be prehardening you cannot be prehardening they cannot be prehardening
Perfect	V-ing perfect
I cannot have prehardened you cannot have prehardened he cannot have prehardened we cannot have prehardened you cannot have prehardened they cannot have prehardened	I cannot have been prehardening you cannot have been prehardening he cannot have been prehardening we cannot have been prehardening you cannot have been prehardening they cannot have been prehardening

Interrogative form

Simple form	V-ing form
can I preharden? can you preharden? can he preharden? can we preharden? can you preharden? can they preharden?	can I be prehardening? can you be prehardening? can he be prehardening? can we be prehardening? can you be prehardening? can they be prehardening?
Perfect	V-ing perfect
can I have prehardened? can you have prehardened? can he have prehardened? can we have prehardened? can you have prehardened? can they have prehardened?	can I have been prehardening? can you have been prehardening? can he have been prehardening? can we have been prehardening? can you have been prehardening? can they have been prehardening?

Interro-negative form

Simple form	V-ing form
can I not preharden? can you not preharden? can he not preharden? can we not preharden? can you not preharden? can they not preharden?	can I not be prehardening? can you not be prehardening? can he not be prehardening? can we not be prehardening? can you not be prehardening? can they not be prehardening?
Perfect	V-ing perfect
can I not have prehardened? can you not have prehardened? can he not have prehardened? can we not have prehardened? can you not have prehardened? can they not have prehardened?	can I not have been prehardening? can you not have been prehardening? can he not have been prehardening? can we not have been prehardening? can you not have been prehardening? can they not have been prehardening?