English verb conjugation
COULD GROUND

Regular verb: ground - grounded - grounded

Affirmation

Simple form	V-ing form
I could ground you could ground she could ground we could ground you could ground they could ground	I could be grounding you could be grounding she 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 she 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 she 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 she 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 she 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 she 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 she 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 she ground? could we ground? could you ground? could they ground?	could I be grounding? could you be grounding? could she 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 she 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 she 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 she 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 she 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 she 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 she have been grounding? couldn't we have been grounding? couldn't you have been grounding? couldn't they have been grounding?