English verb conjugation
CAN SLACKEN

Regular verb: slacken - slackened - slackened

Affirmation

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

Negation

Simple form	V-ing form
I can't slacken you can't slacken she can't slacken we can't slacken you can't slacken they can't slacken	I can't be slackening you can't be slackening she can't be slackening we can't be slackening you can't be slackening they can't be slackening
Perfect	V-ing perfect
I can't have slackened you can't have slackened she can't have slackened we can't have slackened you can't have slackened they can't have slackened	I can't have been slackening you can't have been slackening she can't have been slackening we can't have been slackening you can't have been slackening they can't have been slackening

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I slacken? can't you slacken? can't she slacken? can't we slacken? can't you slacken? can't they slacken?	can't I be slackening? can't you be slackening? can't she be slackening? can't we be slackening? can't you be slackening? can't they be slackening?
Perfect	V-ing perfect
can't I have slackened? can't you have slackened? can't she have slackened? can't we have slackened? can't you have slackened? can't they have slackened?	can't I have been slackening? can't you have been slackening? can't she have been slackening? can't we have been slackening? can't you have been slackening? can't they have been slackening?