English verb conjugation
COULD STITCH

Regular verb: stitch - stitched - stitched

Affirmation

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