could joke
Regular verb: joke - joked- joked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could joke
you could joke
she could joke
we could joke
you could joke
they could joke 	I could be joking
you could be joking
she could be joking
we could be joking
you could be joking
they could be joking	I could have joked
you could have joked
she could have joked
we could have joked
you could have joked
they could have joked	I could have been joking
you could have been joking
she could have been joking
we could have been joking
you could have been joking
they could have been joking	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I joke?
could you joke?
could she joke?
could we joke?
could you joke?
could they joke? 	could I be joking?
could you be joking?
could she be joking?
could we be joking?
could you be joking?
could they be joking? 	could I have joked?
could you have joked?
could she have joked?
could we have joked?
could you have joked?
could they have joked? 	could I have been joking?
could you have been joking?
could she have been joking?
could we have been joking?
could you have been joking?
could they have been joking? 	

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