English verb conjugation
CAN SLACK

Regular verb: slack - slacked - slacked

Affirmation

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

Negation

Simple form	V-ing form
I can't slack you can't slack he can't slack we can't slack you can't slack they can't slack	I can't be slacking you can't be slacking he can't be slacking we can't be slacking you can't be slacking they can't be slacking
Perfect	V-ing perfect
I can't have slacked you can't have slacked he can't have slacked we can't have slacked you can't have slacked they can't have slacked	I can't have been slacking you can't have been slacking he can't have been slacking we can't have been slacking you can't have been slacking they can't have been slacking

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I slack? can't you slack? can't he slack? can't we slack? can't you slack? can't they slack?	can't I be slacking? can't you be slacking? can't he be slacking? can't we be slacking? can't you be slacking? can't they be slacking?
Perfect	V-ing perfect
can't I have slacked? can't you have slacked? can't he have slacked? can't we have slacked? can't you have slacked? can't they have slacked?	can't I have been slacking? can't you have been slacking? can't he have been slacking? can't we have been slacking? can't you have been slacking? can't they have been slacking?