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 couldn't retch you couldn't retch he couldn't retch we couldn't retch you couldn't retch they couldn't retch	I couldn't be retching you couldn't be retching he couldn't be retching we couldn't be retching you couldn't be retching they couldn't be retching
Perfect	V-ing perfect
I couldn't have retched you couldn't have retched he couldn't have retched we couldn't have retched you couldn't have retched they couldn't have retched	I couldn't have been retching you couldn't have been retching he couldn't have been retching we couldn't have been retching you couldn't have been retching they couldn't 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
couldn't I retch? couldn't you retch? couldn't he retch? couldn't we retch? couldn't you retch? couldn't they retch?	couldn't I be retching? couldn't you be retching? couldn't he be retching? couldn't we be retching? couldn't you be retching? couldn't they be retching?
Perfect	V-ing perfect
couldn't I have retched? couldn't you have retched? couldn't he have retched? couldn't we have retched? couldn't you have retched? couldn't they have retched?	couldn't I have been retching? couldn't you have been retching? couldn't he have been retching? couldn't we have been retching? couldn't you have been retching? couldn't they have been retching?