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 could not etch you could not etch he could not etch we could not etch you could not etch they could not etch	I could not be etching you could not be etching he could not be etching we could not be etching you could not be etching they could not be etching
Perfect	V-ing perfect
I could not have etched you could not have etched he could not have etched we could not have etched you could not have etched they could not have etched	I could not have been etching you could not have been etching he could not have been etching we could not have been etching you could not have been etching they could not 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
could I not etch? could you not etch? could he not etch? could we not etch? could you not etch? could they not etch?	could I not be etching? could you not be etching? could he not be etching? could we not be etching? could you not be etching? could they not be etching?
Perfect	V-ing perfect
could I not have etched? could you not have etched? could he not have etched? could we not have etched? could you not have etched? could they not have etched?	could I not have been etching? could you not have been etching? could he not have been etching? could we not have been etching? could you not have been etching? could they not have been etching?