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 cannot slacken you cannot slacken he cannot slacken we cannot slacken you cannot slacken they cannot slacken	I cannot be slackening you cannot be slackening he cannot be slackening we cannot be slackening you cannot be slackening they cannot be slackening
Perfect	V-ing perfect
I cannot have slackened you cannot have slackened he cannot have slackened we cannot have slackened you cannot have slackened they cannot have slackened	I cannot have been slackening you cannot have been slackening he cannot have been slackening we cannot have been slackening you cannot have been slackening they cannot 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 I not slacken? can you not slacken? can he not slacken? can we not slacken? can you not slacken? can they not slacken?	can I not be slackening? can you not be slackening? can he not be slackening? can we not be slackening? can you not be slackening? can they not be slackening?
Perfect	V-ing perfect
can I not have slackened? can you not have slackened? can he not have slackened? can we not have slackened? can you not have slackened? can they not have slackened?	can I not have been slackening? can you not have been slackening? can he not have been slackening? can we not have been slackening? can you not have been slackening? can they not have been slackening?