English verb conjugation
COULD GRIND

Irregular verb: grind - ground - ground

Affirmation

Simple form	V-ing form
I could grind you could grind she could grind we could grind you could grind they could grind	I could be grinding you could be grinding she could be grinding we could be grinding you could be grinding they could be grinding
Perfect	V-ing perfect
I could have ground you could have ground she could have ground we could have ground you could have ground they could have ground	I could have been grinding you could have been grinding she could have been grinding we could have been grinding you could have been grinding they could have been grinding

Negation

Simple form	V-ing form
I could not grind you could not grind she could not grind we could not grind you could not grind they could not grind	I could not be grinding you could not be grinding she could not be grinding we could not be grinding you could not be grinding they could not be grinding
Perfect	V-ing perfect
I could not have ground you could not have ground she could not have ground we could not have ground you could not have ground they could not have ground	I could not have been grinding you could not have been grinding she could not have been grinding we could not have been grinding you could not have been grinding they could not have been grinding

Interrogative form

Simple form	V-ing form
could I grind? could you grind? could she grind? could we grind? could you grind? could they grind?	could I be grinding? could you be grinding? could she be grinding? could we be grinding? could you be grinding? could they be grinding?
Perfect	V-ing perfect
could I have ground? could you have ground? could she have ground? could we have ground? could you have ground? could they have ground?	could I have been grinding? could you have been grinding? could she have been grinding? could we have been grinding? could you have been grinding? could they have been grinding?

Interro-negative form

Simple form	V-ing form
could I not grind? could you not grind? could she not grind? could we not grind? could you not grind? could they not grind?	could I not be grinding? could you not be grinding? could she not be grinding? could we not be grinding? could you not be grinding? could they not be grinding?
Perfect	V-ing perfect
could I not have ground? could you not have ground? could she not have ground? could we not have ground? could you not have ground? could they not have ground?	could I not have been grinding? could you not have been grinding? could she not have been grinding? could we not have been grinding? could you not have been grinding? could they not have been grinding?