I could carve you could carve he could carve we could carve you could carve they could carve
V-ing form
I could be carving you could be carving he could be carving we could be carving you could be carving they could be carving
Perfect
I could have carved you could have carved he could have carved we could have carved you could have carved they could have carved
V-ing perfect
I could have been carving you could have been carving he could have been carving we could have been carving you could have been carving they could have been carving
Negation
Simple form
I could not carve you could not carve he could not carve we could not carve you could not carve they could not carve
V-ing form
I could not be carving you could not be carving he could not be carving we could not be carving you could not be carving they could not be carving
Perfect
I could not have carved you could not have carved he could not have carved we could not have carved you could not have carved they could not have carved
V-ing perfect
I could not have been carving you could not have been carving he could not have been carving we could not have been carving you could not have been carving they could not have been carving
Interrogative form
Simple form
could I carve? could you carve? could he carve? could we carve? could you carve? could they carve?
V-ing form
could I be carving? could you be carving? could he be carving? could we be carving? could you be carving? could they be carving?
Perfect
could I have carved? could you have carved? could he have carved? could we have carved? could you have carved? could they have carved?
V-ing perfect
could I have been carving? could you have been carving? could he have been carving? could we have been carving? could you have been carving? could they have been carving?
Interro-negative form
Simple form
could I not carve? could you not carve? could he not carve? could we not carve? could you not carve? could they not carve?
V-ing form
could I not be carving? could you not be carving? could he not be carving? could we not be carving? could you not be carving? could they not be carving?
Perfect
could I not have carved? could you not have carved? could he not have carved? could we not have carved? could you not have carved? could they not have carved?
V-ing perfect
could I not have been carving? could you not have been carving? could he not have been carving? could we not have been carving? could you not have been carving? could they not have been carving?