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 couldn't ground you couldn't ground he couldn't ground we couldn't ground you couldn't ground they couldn't ground	I couldn't be grounding you couldn't be grounding he couldn't be grounding we couldn't be grounding you couldn't be grounding they couldn't be grounding
Perfect	V-ing perfect
I couldn't have grounded you couldn't have grounded he couldn't have grounded we couldn't have grounded you couldn't have grounded they couldn't have grounded	I couldn't have been grounding you couldn't have been grounding he couldn't have been grounding we couldn't have been grounding you couldn't have been grounding they couldn't 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
couldn't I ground? couldn't you ground? couldn't he ground? couldn't we ground? couldn't you ground? couldn't they ground?	couldn't I be grounding? couldn't you be grounding? couldn't he be grounding? couldn't we be grounding? couldn't you be grounding? couldn't they be grounding?
Perfect	V-ing perfect
couldn't I have grounded? couldn't you have grounded? couldn't he have grounded? couldn't we have grounded? couldn't you have grounded? couldn't they have grounded?	couldn't I have been grounding? couldn't you have been grounding? couldn't he have been grounding? couldn't we have been grounding? couldn't you have been grounding? couldn't they have been grounding?