English verb conjugation
CAN HARDEN

Regular verb: harden - hardened - hardened

Affirmation

Simple form	V-ing form
I can harden you can harden he can harden we can harden you can harden they can harden	I can be hardening you can be hardening he can be hardening we can be hardening you can be hardening they can be hardening
Perfect	V-ing perfect
I can have hardened you can have hardened he can have hardened we can have hardened you can have hardened they can have hardened	I can have been hardening you can have been hardening he can have been hardening we can have been hardening you can have been hardening they can have been hardening

Negation

Simple form	V-ing form
I can't harden you can't harden he can't harden we can't harden you can't harden they can't harden	I can't be hardening you can't be hardening he can't be hardening we can't be hardening you can't be hardening they can't be hardening
Perfect	V-ing perfect
I can't have hardened you can't have hardened he can't have hardened we can't have hardened you can't have hardened they can't have hardened	I can't have been hardening you can't have been hardening he can't have been hardening we can't have been hardening you can't have been hardening they can't have been hardening

Interrogative form

Simple form	V-ing form
can I harden? can you harden? can he harden? can we harden? can you harden? can they harden?	can I be hardening? can you be hardening? can he be hardening? can we be hardening? can you be hardening? can they be hardening?
Perfect	V-ing perfect
can I have hardened? can you have hardened? can he have hardened? can we have hardened? can you have hardened? can they have hardened?	can I have been hardening? can you have been hardening? can he have been hardening? can we have been hardening? can you have been hardening? can they have been hardening?

Interro-negative form

Simple form	V-ing form
can't I harden? can't you harden? can't he harden? can't we harden? can't you harden? can't they harden?	can't I be hardening? can't you be hardening? can't he be hardening? can't we be hardening? can't you be hardening? can't they be hardening?
Perfect	V-ing perfect
can't I have hardened? can't you have hardened? can't he have hardened? can't we have hardened? can't you have hardened? can't they have hardened?	can't I have been hardening? can't you have been hardening? can't he have been hardening? can't we have been hardening? can't you have been hardening? can't they have been hardening?