English verb conjugation
COULD ENGRAVE

Regular verb: engrave - engraved - engraved

Affirmation

Simple form	V-ing form
I could engrave you could engrave she could engrave we could engrave you could engrave they could engrave	I could be engraving you could be engraving she 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 she 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 she 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 couldn't engrave you couldn't engrave she couldn't engrave we couldn't engrave you couldn't engrave they couldn't engrave	I couldn't be engraving you couldn't be engraving she couldn't be engraving we couldn't be engraving you couldn't be engraving they couldn't be engraving
Perfect	V-ing perfect
I couldn't have engraved you couldn't have engraved she couldn't have engraved we couldn't have engraved you couldn't have engraved they couldn't have engraved	I couldn't have been engraving you couldn't have been engraving she couldn't have been engraving we couldn't have been engraving you couldn't have been engraving they couldn't have been engraving

Interrogative form

Simple form	V-ing form
could I engrave? could you engrave? could she engrave? could we engrave? could you engrave? could they engrave?	could I be engraving? could you be engraving? could she 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 she 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 she 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
couldn't I engrave? couldn't you engrave? couldn't she engrave? couldn't we engrave? couldn't you engrave? couldn't they engrave?	couldn't I be engraving? couldn't you be engraving? couldn't she be engraving? couldn't we be engraving? couldn't you be engraving? couldn't they be engraving?
Perfect	V-ing perfect
couldn't I have engraved? couldn't you have engraved? couldn't she have engraved? couldn't we have engraved? couldn't you have engraved? couldn't they have engraved?	couldn't I have been engraving? couldn't you have been engraving? couldn't she have been engraving? couldn't we have been engraving? couldn't you have been engraving? couldn't they have been engraving?