English verb conjugation
COULD GROUND

Regular verb: ground - grounded - grounded

Affirmation

Simple form	V-ing form
I could ground you could ground he could ground we could ground you could ground they could ground	I could be grounding you could be grounding he could be grounding we could be grounding you could be grounding they could be grounding
Perfect	V-ing perfect
I could have grounded you could have grounded he could have grounded we could have grounded you could have grounded they could have grounded	I could have been grounding you could have been grounding he could have been grounding we could have been grounding you could have been grounding they could have been grounding

Negation

Simple form	V-ing form
I could not ground you could not ground he could not ground we could not ground you could not ground they could not ground	I could not be grounding you could not be grounding he could not be grounding we could not be grounding you could not be grounding they could not be grounding
Perfect	V-ing perfect
I could not have grounded you could not have grounded he could not have grounded we could not have grounded you could not have grounded they could not have grounded	I could not have been grounding you could not have been grounding he could not have been grounding we could not have been grounding you could not have been grounding they could not have been grounding

Interrogative form

Simple form	V-ing form
could I ground? could you ground? could he ground? could we ground? could you ground? could they ground?	could I be grounding? could you be grounding? could he be grounding? could we be grounding? could you be grounding? could they be grounding?
Perfect	V-ing perfect
could I have grounded? could you have grounded? could he have grounded? could we have grounded? could you have grounded? could they have grounded?	could I have been grounding? could you have been grounding? could he have been grounding? could we have been grounding? could you have been grounding? could they have been grounding?

Interro-negative form

Simple form	V-ing form
could I not ground? could you not ground? could he not ground? could we not ground? could you not ground? could they not ground?	could I not be grounding? could you not be grounding? could he not be grounding? could we not be grounding? could you not be grounding? could they not be grounding?
Perfect	V-ing perfect
could I not have grounded? could you not have grounded? could he not have grounded? could we not have grounded? could you not have grounded? could they not have grounded?	could I not have been grounding? could you not have been grounding? could he not have been grounding? could we not have been grounding? could you not have been grounding? could they not have been grounding?