English verb conjugation
COULD ENLIGHTEN

Regular verb: enlighten - enlightened - enlightened

Affirmation

Simple form	V-ing form
I could enlighten you could enlighten he could enlighten we could enlighten you could enlighten they could enlighten	I could be enlightening you could be enlightening he could be enlightening we could be enlightening you could be enlightening they could be enlightening
Perfect	V-ing perfect
I could have enlightened you could have enlightened he could have enlightened we could have enlightened you could have enlightened they could have enlightened	I could have been enlightening you could have been enlightening he could have been enlightening we could have been enlightening you could have been enlightening they could have been enlightening

Negation

Simple form	V-ing form
I couldn't enlighten you couldn't enlighten he couldn't enlighten we couldn't enlighten you couldn't enlighten they couldn't enlighten	I couldn't be enlightening you couldn't be enlightening he couldn't be enlightening we couldn't be enlightening you couldn't be enlightening they couldn't be enlightening
Perfect	V-ing perfect
I couldn't have enlightened you couldn't have enlightened he couldn't have enlightened we couldn't have enlightened you couldn't have enlightened they couldn't have enlightened	I couldn't have been enlightening you couldn't have been enlightening he couldn't have been enlightening we couldn't have been enlightening you couldn't have been enlightening they couldn't have been enlightening

Interrogative form

Simple form	V-ing form
could I enlighten? could you enlighten? could he enlighten? could we enlighten? could you enlighten? could they enlighten?	could I be enlightening? could you be enlightening? could he be enlightening? could we be enlightening? could you be enlightening? could they be enlightening?
Perfect	V-ing perfect
could I have enlightened? could you have enlightened? could he have enlightened? could we have enlightened? could you have enlightened? could they have enlightened?	could I have been enlightening? could you have been enlightening? could he have been enlightening? could we have been enlightening? could you have been enlightening? could they have been enlightening?

Interro-negative form

Simple form	V-ing form
couldn't I enlighten? couldn't you enlighten? couldn't he enlighten? couldn't we enlighten? couldn't you enlighten? couldn't they enlighten?	couldn't I be enlightening? couldn't you be enlightening? couldn't he be enlightening? couldn't we be enlightening? couldn't you be enlightening? couldn't they be enlightening?
Perfect	V-ing perfect
couldn't I have enlightened? couldn't you have enlightened? couldn't he have enlightened? couldn't we have enlightened? couldn't you have enlightened? couldn't they have enlightened?	couldn't I have been enlightening? couldn't you have been enlightening? couldn't he have been enlightening? couldn't we have been enlightening? couldn't you have been enlightening? couldn't they have been enlightening?