can joke
Regular verb: joke - joked- joked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I cannot joke
you cannot joke
he cannot joke
we cannot joke
you cannot joke
they cannot joke 	I cannot be joking
you cannot be joking
he cannot be joking
we cannot be joking
you cannot be joking
they cannot be joking	I cannot have joked
you cannot have joked
he cannot have joked
we cannot have joked
you cannot have joked
they cannot have joked	I cannot have been joking
you cannot have been joking
he cannot have been joking
we cannot have been joking
you cannot have been joking
they cannot have been joking	

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