English verb conjugation
COULD HARKEN

Regular verb: harken - harkened - harkened

Affirmation

Simple form	V-ing form
I could harken you could harken she could harken we could harken you could harken they could harken	I could be harkening you could be harkening she could be harkening we could be harkening you could be harkening they could be harkening
Perfect	V-ing perfect
I could have harkened you could have harkened she could have harkened we could have harkened you could have harkened they could have harkened	I could have been harkening you could have been harkening she could have been harkening we could have been harkening you could have been harkening they could have been harkening

Negation

Simple form	V-ing form
I couldn't harken you couldn't harken she couldn't harken we couldn't harken you couldn't harken they couldn't harken	I couldn't be harkening you couldn't be harkening she couldn't be harkening we couldn't be harkening you couldn't be harkening they couldn't be harkening
Perfect	V-ing perfect
I couldn't have harkened you couldn't have harkened she couldn't have harkened we couldn't have harkened you couldn't have harkened they couldn't have harkened	I couldn't have been harkening you couldn't have been harkening she couldn't have been harkening we couldn't have been harkening you couldn't have been harkening they couldn't have been harkening

Interrogative form

Simple form	V-ing form
could I harken? could you harken? could she harken? could we harken? could you harken? could they harken?	could I be harkening? could you be harkening? could she be harkening? could we be harkening? could you be harkening? could they be harkening?
Perfect	V-ing perfect
could I have harkened? could you have harkened? could she have harkened? could we have harkened? could you have harkened? could they have harkened?	could I have been harkening? could you have been harkening? could she have been harkening? could we have been harkening? could you have been harkening? could they have been harkening?

Interro-negative form

Simple form	V-ing form
couldn't I harken? couldn't you harken? couldn't she harken? couldn't we harken? couldn't you harken? couldn't they harken?	couldn't I be harkening? couldn't you be harkening? couldn't she be harkening? couldn't we be harkening? couldn't you be harkening? couldn't they be harkening?
Perfect	V-ing perfect
couldn't I have harkened? couldn't you have harkened? couldn't she have harkened? couldn't we have harkened? couldn't you have harkened? couldn't they have harkened?	couldn't I have been harkening? couldn't you have been harkening? couldn't she have been harkening? couldn't we have been harkening? couldn't you have been harkening? couldn't they have been harkening?