English verb conjugation
CAN BLACKEN

Regular verb: blacken - blackened - blackened

Affirmation

Simple form	V-ing form
I can blacken you can blacken she can blacken we can blacken you can blacken they can blacken	I can be blackening you can be blackening she can be blackening we can be blackening you can be blackening they can be blackening
Perfect	V-ing perfect
I can have blackened you can have blackened she can have blackened we can have blackened you can have blackened they can have blackened	I can have been blackening you can have been blackening she can have been blackening we can have been blackening you can have been blackening they can have been blackening

Negation

Simple form	V-ing form
I can't blacken you can't blacken she can't blacken we can't blacken you can't blacken they can't blacken	I can't be blackening you can't be blackening she can't be blackening we can't be blackening you can't be blackening they can't be blackening
Perfect	V-ing perfect
I can't have blackened you can't have blackened she can't have blackened we can't have blackened you can't have blackened they can't have blackened	I can't have been blackening you can't have been blackening she can't have been blackening we can't have been blackening you can't have been blackening they can't have been blackening

Interrogative form

Simple form	V-ing form
can I blacken? can you blacken? can she blacken? can we blacken? can you blacken? can they blacken?	can I be blackening? can you be blackening? can she be blackening? can we be blackening? can you be blackening? can they be blackening?
Perfect	V-ing perfect
can I have blackened? can you have blackened? can she have blackened? can we have blackened? can you have blackened? can they have blackened?	can I have been blackening? can you have been blackening? can she have been blackening? can we have been blackening? can you have been blackening? can they have been blackening?

Interro-negative form

Simple form	V-ing form
can't I blacken? can't you blacken? can't she blacken? can't we blacken? can't you blacken? can't they blacken?	can't I be blackening? can't you be blackening? can't she be blackening? can't we be blackening? can't you be blackening? can't they be blackening?
Perfect	V-ing perfect
can't I have blackened? can't you have blackened? can't she have blackened? can't we have blackened? can't you have blackened? can't they have blackened?	can't I have been blackening? can't you have been blackening? can't she have been blackening? can't we have been blackening? can't you have been blackening? can't they have been blackening?