could whipstitch
Regular verb: whipstitch - whipstitched- whipstitched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could whipstitch
you could whipstitch
he could whipstitch
we could whipstitch
you could whipstitch
they could whipstitch 	I could be whipstitching
you could be whipstitching
he could be whipstitching
we could be whipstitching
you could be whipstitching
they could be whipstitching	I could have whipstitched
you could have whipstitched
he could have whipstitched
we could have whipstitched
you could have whipstitched
they could have whipstitched	I could have been whipstitching
you could have been whipstitching
he could have been whipstitching
we could have been whipstitching
you could have been whipstitching
they could have been whipstitching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't whipstitch
you couldn't whipstitch
he couldn't whipstitch
we couldn't whipstitch
you couldn't whipstitch
they couldn't whipstitch 	I couldn't be whipstitching
you couldn't be whipstitching
he couldn't be whipstitching
we couldn't be whipstitching
you couldn't be whipstitching
they couldn't be whipstitching	I couldn't have whipstitched
you couldn't have whipstitched
he couldn't have whipstitched
we couldn't have whipstitched
you couldn't have whipstitched
they couldn't have whipstitched	I couldn't have been whipstitching
you couldn't have been whipstitching
he couldn't have been whipstitching
we couldn't have been whipstitching
you couldn't have been whipstitching
they couldn't have been whipstitching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I whipstitch?
could you whipstitch?
could he whipstitch?
could we whipstitch?
could you whipstitch?
could they whipstitch? 	could I be whipstitching?
could you be whipstitching?
could he be whipstitching?
could we be whipstitching?
could you be whipstitching?
could they be whipstitching? 	could I have whipstitched?
could you have whipstitched?
could he have whipstitched?
could we have whipstitched?
could you have whipstitched?
could they have whipstitched? 	could I have been whipstitching?
could you have been whipstitching?
could he have been whipstitching?
could we have been whipstitching?
could you have been whipstitching?
could they have been whipstitching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I whipstitch?
couldn't you whipstitch?
couldn't he whipstitch?
couldn't we whipstitch?
couldn't you whipstitch?
couldn't they whipstitch? 	couldn't I be whipstitching?
couldn't you be whipstitching?
couldn't he be whipstitching?
couldn't we be whipstitching?
couldn't you be whipstitching?
couldn't they be whipstitching? 	couldn't I have whipstitched?
couldn't you have whipstitched?
couldn't he have whipstitched?
couldn't we have whipstitched?
couldn't you have whipstitched?
couldn't they have whipstitched? 	couldn't I have been whipstitching?
couldn't you have been whipstitching?
couldn't he have been whipstitching?
couldn't we have been whipstitching?
couldn't you have been whipstitching?
couldn't they have been whipstitching?