English verb conjugation
CAN PREHARDEN

Regular verb: preharden - prehardened - prehardened

Affirmation

Simple form	V-ing form
I can preharden you can preharden she can preharden we can preharden you can preharden they can preharden	I can be prehardening you can be prehardening she 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 she 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 she 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 can't preharden you can't preharden she can't preharden we can't preharden you can't preharden they can't preharden	I can't be prehardening you can't be prehardening she can't be prehardening we can't be prehardening you can't be prehardening they can't be prehardening
Perfect	V-ing perfect
I can't have prehardened you can't have prehardened she can't have prehardened we can't have prehardened you can't have prehardened they can't have prehardened	I can't have been prehardening you can't have been prehardening she can't have been prehardening we can't have been prehardening you can't have been prehardening they can't have been prehardening

Interrogative form

Simple form	V-ing form
can I preharden? can you preharden? can she preharden? can we preharden? can you preharden? can they preharden?	can I be prehardening? can you be prehardening? can she 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 she 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 she 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't I preharden? can't you preharden? can't she preharden? can't we preharden? can't you preharden? can't they preharden?	can't I be prehardening? can't you be prehardening? can't she be prehardening? can't we be prehardening? can't you be prehardening? can't they be prehardening?
Perfect	V-ing perfect
can't I have prehardened? can't you have prehardened? can't she have prehardened? can't we have prehardened? can't you have prehardened? can't they have prehardened?	can't I have been prehardening? can't you have been prehardening? can't she have been prehardening? can't we have been prehardening? can't you have been prehardening? can't they have been prehardening?