could jib
Regular verb: jib - jibbed- jibbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could jib
you could jib
he could jib
we could jib
you could jib
they could jib 	I could be jibbing
you could be jibbing
he could be jibbing
we could be jibbing
you could be jibbing
they could be jibbing	I could have jibbed
you could have jibbed
he could have jibbed
we could have jibbed
you could have jibbed
they could have jibbed	I could have been jibbing
you could have been jibbing
he could have been jibbing
we could have been jibbing
you could have been jibbing
they could have been jibbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't jib
you couldn't jib
he couldn't jib
we couldn't jib
you couldn't jib
they couldn't jib 	I couldn't be jibbing
you couldn't be jibbing
he couldn't be jibbing
we couldn't be jibbing
you couldn't be jibbing
they couldn't be jibbing	I couldn't have jibbed
you couldn't have jibbed
he couldn't have jibbed
we couldn't have jibbed
you couldn't have jibbed
they couldn't have jibbed	I couldn't have been jibbing
you couldn't have been jibbing
he couldn't have been jibbing
we couldn't have been jibbing
you couldn't have been jibbing
they couldn't have been jibbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I jib?
could you jib?
could he jib?
could we jib?
could you jib?
could they jib? 	could I be jibbing?
could you be jibbing?
could he be jibbing?
could we be jibbing?
could you be jibbing?
could they be jibbing? 	could I have jibbed?
could you have jibbed?
could he have jibbed?
could we have jibbed?
could you have jibbed?
could they have jibbed? 	could I have been jibbing?
could you have been jibbing?
could he have been jibbing?
could we have been jibbing?
could you have been jibbing?
could they have been jibbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I jib?
couldn't you jib?
couldn't he jib?
couldn't we jib?
couldn't you jib?
couldn't they jib? 	couldn't I be jibbing?
couldn't you be jibbing?
couldn't he be jibbing?
couldn't we be jibbing?
couldn't you be jibbing?
couldn't they be jibbing? 	couldn't I have jibbed?
couldn't you have jibbed?
couldn't he have jibbed?
couldn't we have jibbed?
couldn't you have jibbed?
couldn't they have jibbed? 	couldn't I have been jibbing?
couldn't you have been jibbing?
couldn't he have been jibbing?
couldn't we have been jibbing?
couldn't you have been jibbing?
couldn't they have been jibbing?