English verb conjugation
COULD SLACK

Regular verb: slack - slacked - slacked

Affirmation

Simple form	V-ing form
I could slack you could slack he could slack we could slack you could slack they could slack	I could be slacking you could be slacking he could be slacking we could be slacking you could be slacking they could be slacking
Perfect	V-ing perfect
I could have slacked you could have slacked he could have slacked we could have slacked you could have slacked they could have slacked	I could have been slacking you could have been slacking he could have been slacking we could have been slacking you could have been slacking they could have been slacking

Negation

Simple form	V-ing form
I could not slack you could not slack he could not slack we could not slack you could not slack they could not slack	I could not be slacking you could not be slacking he could not be slacking we could not be slacking you could not be slacking they could not be slacking
Perfect	V-ing perfect
I could not have slacked you could not have slacked he could not have slacked we could not have slacked you could not have slacked they could not have slacked	I could not have been slacking you could not have been slacking he could not have been slacking we could not have been slacking you could not have been slacking they could not have been slacking

Interrogative form

Simple form	V-ing form
could I slack? could you slack? could he slack? could we slack? could you slack? could they slack?	could I be slacking? could you be slacking? could he be slacking? could we be slacking? could you be slacking? could they be slacking?
Perfect	V-ing perfect
could I have slacked? could you have slacked? could he have slacked? could we have slacked? could you have slacked? could they have slacked?	could I have been slacking? could you have been slacking? could he have been slacking? could we have been slacking? could you have been slacking? could they have been slacking?

Interro-negative form

Simple form	V-ing form
could I not slack? could you not slack? could he not slack? could we not slack? could you not slack? could they not slack?	could I not be slacking? could you not be slacking? could he not be slacking? could we not be slacking? could you not be slacking? could they not be slacking?
Perfect	V-ing perfect
could I not have slacked? could you not have slacked? could he not have slacked? could we not have slacked? could you not have slacked? could they not have slacked?	could I not have been slacking? could you not have been slacking? could he not have been slacking? could we not have been slacking? could you not have been slacking? could they not have been slacking?