English verb conjugation
CAN SLACKEN

Regular verb: slacken - slackened - slackened

Affirmation

Simple form	V-ing form
I can slacken you can slacken he can slacken we can slacken you can slacken they can slacken	I can be slackening you can be slackening he 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 he 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 he 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 he 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 he 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 he 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 he 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 he slacken? can we slacken? can you slacken? can they slacken?	can I be slackening? can you be slackening? can he 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 he 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 he 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 he 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 he 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 he 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 he have been slackening? can't we have been slackening? can't you have been slackening? can't they have been slackening?