English verb conjugation
COULD RETCH

Regular verb: retch - retched - retched

Affirmation

Simple form	V-ing form
I could retch you could retch he could retch we could retch you could retch they could retch	I could be retching you could be retching he could be retching we could be retching you could be retching they could be retching
Perfect	V-ing perfect
I could have retched you could have retched he could have retched we could have retched you could have retched they could have retched	I could have been retching you could have been retching he could have been retching we could have been retching you could have been retching they could have been retching

Negation

Simple form	V-ing form
I could not retch you could not retch he could not retch we could not retch you could not retch they could not retch	I could not be retching you could not be retching he could not be retching we could not be retching you could not be retching they could not be retching
Perfect	V-ing perfect
I could not have retched you could not have retched he could not have retched we could not have retched you could not have retched they could not have retched	I could not have been retching you could not have been retching he could not have been retching we could not have been retching you could not have been retching they could not have been retching

Interrogative form

Simple form	V-ing form
could I retch? could you retch? could he retch? could we retch? could you retch? could they retch?	could I be retching? could you be retching? could he be retching? could we be retching? could you be retching? could they be retching?
Perfect	V-ing perfect
could I have retched? could you have retched? could he have retched? could we have retched? could you have retched? could they have retched?	could I have been retching? could you have been retching? could he have been retching? could we have been retching? could you have been retching? could they have been retching?

Interro-negative form

Simple form	V-ing form
could I not retch? could you not retch? could he not retch? could we not retch? could you not retch? could they not retch?	could I not be retching? could you not be retching? could he not be retching? could we not be retching? could you not be retching? could they not be retching?
Perfect	V-ing perfect
could I not have retched? could you not have retched? could he not have retched? could we not have retched? could you not have retched? could they not have retched?	could I not have been retching? could you not have been retching? could he not have been retching? could we not have been retching? could you not have been retching? could they not have been retching?