could stitch
Regular verb: stitch - stitched- stitched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could stitch
you could stitch
he could stitch
we could stitch
you could stitch
they could stitch 	I could be stitching
you could be stitching
he could be stitching
we could be stitching
you could be stitching
they could be stitching	I could have stitched
you could have stitched
he could have stitched
we could have stitched
you could have stitched
they could have stitched	I could have been stitching
you could have been stitching
he could have been stitching
we could have been stitching
you could have been stitching
they could have been stitching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not stitch
you could not stitch
he could not stitch
we could not stitch
you could not stitch
they could not stitch 	I could not be stitching
you could not be stitching
he could not be stitching
we could not be stitching
you could not be stitching
they could not be stitching	I could not have stitched
you could not have stitched
he could not have stitched
we could not have stitched
you could not have stitched
they could not have stitched	I could not have been stitching
you could not have been stitching
he could not have been stitching
we could not have been stitching
you could not have been stitching
they could not have been stitching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I stitch?
could you stitch?
could he stitch?
could we stitch?
could you stitch?
could they stitch? 	could I be stitching?
could you be stitching?
could he be stitching?
could we be stitching?
could you be stitching?
could they be stitching? 	could I have stitched?
could you have stitched?
could he have stitched?
could we have stitched?
could you have stitched?
could they have stitched? 	could I have been stitching?
could you have been stitching?
could he have been stitching?
could we have been stitching?
could you have been stitching?
could they have been stitching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not stitch?
could you not stitch?
could he not stitch?
could we not stitch?
could you not stitch?
could they not stitch? 	could I not be stitching?
could you not be stitching?
could he not be stitching?
could we not be stitching?
could you not be stitching?
could they not be stitching? 	could I not have stitched?
could you not have stitched?
could he not have stitched?
could we not have stitched?
could you not have stitched?
could they not have stitched? 	could I not have been stitching?
could you not have been stitching?
could he not have been stitching?
could we not have been stitching?
could you not have been stitching?
could they not have been stitching?