can joke
Regular verb: joke - joked- joked

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