English verb conjugation
COULD UNSTITCH

Regular verb: unstitch - unstitched - unstitched

Affirmation

Simple form	V-ing form
I could unstitch you could unstitch he could unstitch we could unstitch you could unstitch they could unstitch	I could be unstitching you could be unstitching he could be unstitching we could be unstitching you could be unstitching they could be unstitching
Perfect	V-ing perfect
I could have unstitched you could have unstitched he could have unstitched we could have unstitched you could have unstitched they could have unstitched	I could have been unstitching you could have been unstitching he could have been unstitching we could have been unstitching you could have been unstitching they could have been unstitching

Negation

Simple form	V-ing form
I couldn't unstitch you couldn't unstitch he couldn't unstitch we couldn't unstitch you couldn't unstitch they couldn't unstitch	I couldn't be unstitching you couldn't be unstitching he couldn't be unstitching we couldn't be unstitching you couldn't be unstitching they couldn't be unstitching
Perfect	V-ing perfect
I couldn't have unstitched you couldn't have unstitched he couldn't have unstitched we couldn't have unstitched you couldn't have unstitched they couldn't have unstitched	I couldn't have been unstitching you couldn't have been unstitching he couldn't have been unstitching we couldn't have been unstitching you couldn't have been unstitching they couldn't have been unstitching

Interrogative form

Simple form	V-ing form
could I unstitch? could you unstitch? could he unstitch? could we unstitch? could you unstitch? could they unstitch?	could I be unstitching? could you be unstitching? could he be unstitching? could we be unstitching? could you be unstitching? could they be unstitching?
Perfect	V-ing perfect
could I have unstitched? could you have unstitched? could he have unstitched? could we have unstitched? could you have unstitched? could they have unstitched?	could I have been unstitching? could you have been unstitching? could he have been unstitching? could we have been unstitching? could you have been unstitching? could they have been unstitching?

Interro-negative form

Simple form	V-ing form
couldn't I unstitch? couldn't you unstitch? couldn't he unstitch? couldn't we unstitch? couldn't you unstitch? couldn't they unstitch?	couldn't I be unstitching? couldn't you be unstitching? couldn't he be unstitching? couldn't we be unstitching? couldn't you be unstitching? couldn't they be unstitching?
Perfect	V-ing perfect
couldn't I have unstitched? couldn't you have unstitched? couldn't he have unstitched? couldn't we have unstitched? couldn't you have unstitched? couldn't they have unstitched?	couldn't I have been unstitching? couldn't you have been unstitching? couldn't he have been unstitching? couldn't we have been unstitching? couldn't you have been unstitching? couldn't they have been unstitching?