English verb conjugation
COULD WIDEN

Regular verb: widen - widened - widened

Affirmation

Simple form	V-ing form
I could widen you could widen she could widen we could widen you could widen they could widen	I could be widening you could be widening she could be widening we could be widening you could be widening they could be widening
Perfect	V-ing perfect
I could have widened you could have widened she could have widened we could have widened you could have widened they could have widened	I could have been widening you could have been widening she could have been widening we could have been widening you could have been widening they could have been widening

Negation

Simple form	V-ing form
I couldn't widen you couldn't widen she couldn't widen we couldn't widen you couldn't widen they couldn't widen	I couldn't be widening you couldn't be widening she couldn't be widening we couldn't be widening you couldn't be widening they couldn't be widening
Perfect	V-ing perfect
I couldn't have widened you couldn't have widened she couldn't have widened we couldn't have widened you couldn't have widened they couldn't have widened	I couldn't have been widening you couldn't have been widening she couldn't have been widening we couldn't have been widening you couldn't have been widening they couldn't have been widening

Interrogative form

Simple form	V-ing form
could I widen? could you widen? could she widen? could we widen? could you widen? could they widen?	could I be widening? could you be widening? could she be widening? could we be widening? could you be widening? could they be widening?
Perfect	V-ing perfect
could I have widened? could you have widened? could she have widened? could we have widened? could you have widened? could they have widened?	could I have been widening? could you have been widening? could she have been widening? could we have been widening? could you have been widening? could they have been widening?

Interro-negative form

Simple form	V-ing form
couldn't I widen? couldn't you widen? couldn't she widen? couldn't we widen? couldn't you widen? couldn't they widen?	couldn't I be widening? couldn't you be widening? couldn't she be widening? couldn't we be widening? couldn't you be widening? couldn't they be widening?
Perfect	V-ing perfect
couldn't I have widened? couldn't you have widened? couldn't she have widened? couldn't we have widened? couldn't you have widened? couldn't they have widened?	couldn't I have been widening? couldn't you have been widening? couldn't she have been widening? couldn't we have been widening? couldn't you have been widening? couldn't they have been widening?