English verb conjugation
CAN RETCH

Regular verb: retch - retched - retched

Affirmation

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

Negation

Simple form	V-ing form
I can't retch you can't retch he can't retch we can't retch you can't retch they can't retch	I can't be retching you can't be retching he can't be retching we can't be retching you can't be retching they can't be retching
Perfect	V-ing perfect
I can't have retched you can't have retched he can't have retched we can't have retched you can't have retched they can't have retched	I can't have been retching you can't have been retching he can't have been retching we can't have been retching you can't have been retching they can't have been retching

Interrogative form

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

Interro-negative form

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