English verb conjugation
COULD ETCH

Regular verb: etch - etched - etched

Affirmation

Simple form	V-ing form
I could etch you could etch he could etch we could etch you could etch they could etch	I could be etching you could be etching he could be etching we could be etching you could be etching they could be etching
Perfect	V-ing perfect
I could have etched you could have etched he could have etched we could have etched you could have etched they could have etched	I could have been etching you could have been etching he could have been etching we could have been etching you could have been etching they could have been etching

Negation

Simple form	V-ing form
I couldn't etch you couldn't etch he couldn't etch we couldn't etch you couldn't etch they couldn't etch	I couldn't be etching you couldn't be etching he couldn't be etching we couldn't be etching you couldn't be etching they couldn't be etching
Perfect	V-ing perfect
I couldn't have etched you couldn't have etched he couldn't have etched we couldn't have etched you couldn't have etched they couldn't have etched	I couldn't have been etching you couldn't have been etching he couldn't have been etching we couldn't have been etching you couldn't have been etching they couldn't have been etching

Interrogative form

Simple form	V-ing form
could I etch? could you etch? could he etch? could we etch? could you etch? could they etch?	could I be etching? could you be etching? could he be etching? could we be etching? could you be etching? could they be etching?
Perfect	V-ing perfect
could I have etched? could you have etched? could he have etched? could we have etched? could you have etched? could they have etched?	could I have been etching? could you have been etching? could he have been etching? could we have been etching? could you have been etching? could they have been etching?

Interro-negative form

Simple form	V-ing form
couldn't I etch? couldn't you etch? couldn't he etch? couldn't we etch? couldn't you etch? couldn't they etch?	couldn't I be etching? couldn't you be etching? couldn't he be etching? couldn't we be etching? couldn't you be etching? couldn't they be etching?
Perfect	V-ing perfect
couldn't I have etched? couldn't you have etched? couldn't he have etched? couldn't we have etched? couldn't you have etched? couldn't they have etched?	couldn't I have been etching? couldn't you have been etching? couldn't he have been etching? couldn't we have been etching? couldn't you have been etching? couldn't they have been etching?