English verb conjugation
COULD ENGRAVE

Regular verb: engrave - engraved - engraved

Affirmation

Simple form	V-ing form
I could engrave you could engrave he could engrave we could engrave you could engrave they could engrave	I could be engraving you could be engraving he could be engraving we could be engraving you could be engraving they could be engraving
Perfect	V-ing perfect
I could have engraved you could have engraved he could have engraved we could have engraved you could have engraved they could have engraved	I could have been engraving you could have been engraving he could have been engraving we could have been engraving you could have been engraving they could have been engraving

Negation

Simple form	V-ing form
I could not engrave you could not engrave he could not engrave we could not engrave you could not engrave they could not engrave	I could not be engraving you could not be engraving he could not be engraving we could not be engraving you could not be engraving they could not be engraving
Perfect	V-ing perfect
I could not have engraved you could not have engraved he could not have engraved we could not have engraved you could not have engraved they could not have engraved	I could not have been engraving you could not have been engraving he could not have been engraving we could not have been engraving you could not have been engraving they could not have been engraving

Interrogative form

Simple form	V-ing form
could I engrave? could you engrave? could he engrave? could we engrave? could you engrave? could they engrave?	could I be engraving? could you be engraving? could he be engraving? could we be engraving? could you be engraving? could they be engraving?
Perfect	V-ing perfect
could I have engraved? could you have engraved? could he have engraved? could we have engraved? could you have engraved? could they have engraved?	could I have been engraving? could you have been engraving? could he have been engraving? could we have been engraving? could you have been engraving? could they have been engraving?

Interro-negative form

Simple form	V-ing form
could I not engrave? could you not engrave? could he not engrave? could we not engrave? could you not engrave? could they not engrave?	could I not be engraving? could you not be engraving? could he not be engraving? could we not be engraving? could you not be engraving? could they not be engraving?
Perfect	V-ing perfect
could I not have engraved? could you not have engraved? could he not have engraved? could we not have engraved? could you not have engraved? could they not have engraved?	could I not have been engraving? could you not have been engraving? could he not have been engraving? could we not have been engraving? could you not have been engraving? could they not have been engraving?