English verb conjugation
COULD GRAVE

Regular verb: grave - graved - graved

Affirmation

Simple form	V-ing form
I could grave you could grave he could grave we could grave you could grave they could grave	I could be graving you could be graving he could be graving we could be graving you could be graving they could be graving
Perfect	V-ing perfect
I could have graved you could have graved he could have graved we could have graved you could have graved they could have graved	I could have been graving you could have been graving he could have been graving we could have been graving you could have been graving they could have been graving

Negation

Simple form	V-ing form
I couldn't grave you couldn't grave he couldn't grave we couldn't grave you couldn't grave they couldn't grave	I couldn't be graving you couldn't be graving he couldn't be graving we couldn't be graving you couldn't be graving they couldn't be graving
Perfect	V-ing perfect
I couldn't have graved you couldn't have graved he couldn't have graved we couldn't have graved you couldn't have graved they couldn't have graved	I couldn't have been graving you couldn't have been graving he couldn't have been graving we couldn't have been graving you couldn't have been graving they couldn't have been graving

Interrogative form

Simple form	V-ing form
could I grave? could you grave? could he grave? could we grave? could you grave? could they grave?	could I be graving? could you be graving? could he be graving? could we be graving? could you be graving? could they be graving?
Perfect	V-ing perfect
could I have graved? could you have graved? could he have graved? could we have graved? could you have graved? could they have graved?	could I have been graving? could you have been graving? could he have been graving? could we have been graving? could you have been graving? could they have been graving?

Interro-negative form

Simple form	V-ing form
couldn't I grave? couldn't you grave? couldn't he grave? couldn't we grave? couldn't you grave? couldn't they grave?	couldn't I be graving? couldn't you be graving? couldn't he be graving? couldn't we be graving? couldn't you be graving? couldn't they be graving?
Perfect	V-ing perfect
couldn't I have graved? couldn't you have graved? couldn't he have graved? couldn't we have graved? couldn't you have graved? couldn't they have graved?	couldn't I have been graving? couldn't you have been graving? couldn't he have been graving? couldn't we have been graving? couldn't you have been graving? couldn't they have been graving?