English verb conjugation
COULD SLACKEN

Regular verb: slacken - slackened - slackened

Affirmation

Simple form	V-ing form
I could slacken you could slacken he could slacken we could slacken you could slacken they could slacken	I could be slackening you could be slackening he could be slackening we could be slackening you could be slackening they could be slackening
Perfect	V-ing perfect
I could have slackened you could have slackened he could have slackened we could have slackened you could have slackened they could have slackened	I could have been slackening you could have been slackening he could have been slackening we could have been slackening you could have been slackening they could have been slackening

Negation

Simple form	V-ing form
I could not slacken you could not slacken he could not slacken we could not slacken you could not slacken they could not slacken	I could not be slackening you could not be slackening he could not be slackening we could not be slackening you could not be slackening they could not be slackening
Perfect	V-ing perfect
I could not have slackened you could not have slackened he could not have slackened we could not have slackened you could not have slackened they could not have slackened	I could not have been slackening you could not have been slackening he could not have been slackening we could not have been slackening you could not have been slackening they could not have been slackening

Interrogative form

Simple form	V-ing form
could I slacken? could you slacken? could he slacken? could we slacken? could you slacken? could they slacken?	could I be slackening? could you be slackening? could he be slackening? could we be slackening? could you be slackening? could they be slackening?
Perfect	V-ing perfect
could I have slackened? could you have slackened? could he have slackened? could we have slackened? could you have slackened? could they have slackened?	could I have been slackening? could you have been slackening? could he have been slackening? could we have been slackening? could you have been slackening? could they have been slackening?

Interro-negative form

Simple form	V-ing form
could I not slacken? could you not slacken? could he not slacken? could we not slacken? could you not slacken? could they not slacken?	could I not be slackening? could you not be slackening? could he not be slackening? could we not be slackening? could you not be slackening? could they not be slackening?
Perfect	V-ing perfect
could I not have slackened? could you not have slackened? could he not have slackened? could we not have slackened? could you not have slackened? could they not have slackened?	could I not have been slackening? could you not have been slackening? could he not have been slackening? could we not have been slackening? could you not have been slackening? could they not have been slackening?