English verb conjugation
CAN JOKE

Regular verb: joke - joked - joked

Affirmation

Simple form	V-ing form
I can joke you can joke he can joke we can joke you can joke they can joke	I can be joking you can be joking he can be joking we can be joking you can be joking they can be joking
Perfect	V-ing perfect
I can have joked you can have joked he can have joked we can have joked you can have joked they can have joked	I can have been joking you can have been joking he can have been joking we can have been joking you can have been joking they can have been joking

Negation

Simple form	V-ing form
I can't joke you can't joke he can't joke we can't joke you can't joke they can't joke	I can't be joking you can't be joking he can't be joking we can't be joking you can't be joking they can't be joking
Perfect	V-ing perfect
I can't have joked you can't have joked he can't have joked we can't have joked you can't have joked they can't have joked	I can't have been joking you can't have been joking he can't have been joking we can't have been joking you can't have been joking they can't have been joking

Interrogative form

Simple form	V-ing form
can I joke? can you joke? can he joke? can we joke? can you joke? can they joke?	can I be joking? can you be joking? can he be joking? can we be joking? can you be joking? can they be joking?
Perfect	V-ing perfect
can I have joked? can you have joked? can he have joked? can we have joked? can you have joked? can they have joked?	can I have been joking? can you have been joking? can he have been joking? can we have been joking? can you have been joking? can they have been joking?

Interro-negative form

Simple form	V-ing form
can't I joke? can't you joke? can't he joke? can't we joke? can't you joke? can't they joke?	can't I be joking? can't you be joking? can't he be joking? can't we be joking? can't you be joking? can't they be joking?
Perfect	V-ing perfect
can't I have joked? can't you have joked? can't he have joked? can't we have joked? can't you have joked? can't they have joked?	can't I have been joking? can't you have been joking? can't he have been joking? can't we have been joking? can't you have been joking? can't they have been joking?