Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could etch etch you could etch etch he could etch etch we could etch etch you could etch etch they could etch etch
V-ing form
I could be etch etching you could be etch etching he could be etch etching we could be etch etching you could be etch etching they could be etch etching
Perfect
I could have etch etched you could have etch etched he could have etch etched we could have etch etched you could have etch etched they could have etch etched
V-ing perfect
I could have been etch etching you could have been etch etching he could have been etch etching we could have been etch etching you could have been etch etching they could have been etch etching
Negation
Simple form
I couldn't etch etch you couldn't etch etch he couldn't etch etch we couldn't etch etch you couldn't etch etch they couldn't etch etch
V-ing form
I couldn't be etch etching you couldn't be etch etching he couldn't be etch etching we couldn't be etch etching you couldn't be etch etching they couldn't be etch etching
Perfect
I couldn't have etch etched you couldn't have etch etched he couldn't have etch etched we couldn't have etch etched you couldn't have etch etched they couldn't have etch etched
V-ing perfect
I couldn't have been etch etching you couldn't have been etch etching he couldn't have been etch etching we couldn't have been etch etching you couldn't have been etch etching they couldn't have been etch etching
Interrogative form
Simple form
could I etch etch? could you etch etch? could he etch etch? could we etch etch? could you etch etch? could they etch etch?
V-ing form
could I be etch etching? could you be etch etching? could he be etch etching? could we be etch etching? could you be etch etching? could they be etch etching?
Perfect
could I have etch etched? could you have etch etched? could he have etch etched? could we have etch etched? could you have etch etched? could they have etch etched?
V-ing perfect
could I have been etch etching? could you have been etch etching? could he have been etch etching? could we have been etch etching? could you have been etch etching? could they have been etch etching?
Interro-negative form
Simple form
couldn't I etch etch? couldn't you etch etch? couldn't he etch etch? couldn't we etch etch? couldn't you etch etch? couldn't they etch etch?
V-ing form
couldn't I be etch etching? couldn't you be etch etching? couldn't he be etch etching? couldn't we be etch etching? couldn't you be etch etching? couldn't they be etch etching?
Perfect
couldn't I have etch etched? couldn't you have etch etched? couldn't he have etch etched? couldn't we have etch etched? couldn't you have etch etched? couldn't they have etch etched?
V-ing perfect
couldn't I have been etch etching? couldn't you have been etch etching? couldn't he have been etch etching? couldn't we have been etch etching? couldn't you have been etch etching? couldn't they have been etch etching?