I could diaper you could diaper she could diaper we could diaper you could diaper they could diaper
V-ing form
I could be diapering you could be diapering she could be diapering we could be diapering you could be diapering they could be diapering
Perfect
I could have diapered you could have diapered she could have diapered we could have diapered you could have diapered they could have diapered
V-ing perfect
I could have been diapering you could have been diapering she could have been diapering we could have been diapering you could have been diapering they could have been diapering
Negation
Simple form
I could not diaper you could not diaper she could not diaper we could not diaper you could not diaper they could not diaper
V-ing form
I could not be diapering you could not be diapering she could not be diapering we could not be diapering you could not be diapering they could not be diapering
Perfect
I could not have diapered you could not have diapered she could not have diapered we could not have diapered you could not have diapered they could not have diapered
V-ing perfect
I could not have been diapering you could not have been diapering she could not have been diapering we could not have been diapering you could not have been diapering they could not have been diapering
Interrogative form
Simple form
could I diaper? could you diaper? could she diaper? could we diaper? could you diaper? could they diaper?
V-ing form
could I be diapering? could you be diapering? could she be diapering? could we be diapering? could you be diapering? could they be diapering?
Perfect
could I have diapered? could you have diapered? could she have diapered? could we have diapered? could you have diapered? could they have diapered?
V-ing perfect
could I have been diapering? could you have been diapering? could she have been diapering? could we have been diapering? could you have been diapering? could they have been diapering?
Interro-negative form
Simple form
could I not diaper? could you not diaper? could she not diaper? could we not diaper? could you not diaper? could they not diaper?
V-ing form
could I not be diapering? could you not be diapering? could she not be diapering? could we not be diapering? could you not be diapering? could they not be diapering?
Perfect
could I not have diapered? could you not have diapered? could she not have diapered? could we not have diapered? could you not have diapered? could they not have diapered?
V-ing perfect
could I not have been diapering? could you not have been diapering? could she not have been diapering? could we not have been diapering? could you not have been diapering? could they not have been diapering?