Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could sew sew you could sew sew she could sew sew we could sew sew you could sew sew they could sew sew
V-ing form
I could be sew sewing you could be sew sewing she could be sew sewing we could be sew sewing you could be sew sewing they could be sew sewing
Perfect
I could have sew sewed you could have sew sewed she could have sew sewed we could have sew sewed you could have sew sewed they could have sew sewed
V-ing perfect
I could have been sew sewing you could have been sew sewing she could have been sew sewing we could have been sew sewing you could have been sew sewing they could have been sew sewing
Negation
Simple form
I could not sew sew you could not sew sew she could not sew sew we could not sew sew you could not sew sew they could not sew sew
V-ing form
I could not be sew sewing you could not be sew sewing she could not be sew sewing we could not be sew sewing you could not be sew sewing they could not be sew sewing
Perfect
I could not have sew sewed you could not have sew sewed she could not have sew sewed we could not have sew sewed you could not have sew sewed they could not have sew sewed
V-ing perfect
I could not have been sew sewing you could not have been sew sewing she could not have been sew sewing we could not have been sew sewing you could not have been sew sewing they could not have been sew sewing
Interrogative form
Simple form
could I sew sew? could you sew sew? could she sew sew? could we sew sew? could you sew sew? could they sew sew?
V-ing form
could I be sew sewing? could you be sew sewing? could she be sew sewing? could we be sew sewing? could you be sew sewing? could they be sew sewing?
Perfect
could I have sew sewed? could you have sew sewed? could she have sew sewed? could we have sew sewed? could you have sew sewed? could they have sew sewed?
V-ing perfect
could I have been sew sewing? could you have been sew sewing? could she have been sew sewing? could we have been sew sewing? could you have been sew sewing? could they have been sew sewing?
Interro-negative form
Simple form
could I not sew sew? could you not sew sew? could she not sew sew? could we not sew sew? could you not sew sew? could they not sew sew?
V-ing form
could I not be sew sewing? could you not be sew sewing? could she not be sew sewing? could we not be sew sewing? could you not be sew sewing? could they not be sew sewing?
Perfect
could I not have sew sewed? could you not have sew sewed? could she not have sew sewed? could we not have sew sewed? could you not have sew sewed? could they not have sew sewed?
V-ing perfect
could I not have been sew sewing? could you not have been sew sewing? could she not have been sew sewing? could we not have been sew sewing? could you not have been sew sewing? could they not have been sew sewing?