I could mow you could mow he could mow we could mow you could mow they could mow
V-ing form
I could be mowing you could be mowing he could be mowing we could be mowing you could be mowing they could be mowing
Perfect
I could have mown you could have mown he could have mown we could have mown you could have mown they could have mown
V-ing perfect
I could have been mowing you could have been mowing he could have been mowing we could have been mowing you could have been mowing they could have been mowing
Negation
Simple form
I could not mow you could not mow he could not mow we could not mow you could not mow they could not mow
V-ing form
I could not be mowing you could not be mowing he could not be mowing we could not be mowing you could not be mowing they could not be mowing
Perfect
I could not have mown you could not have mown he could not have mown we could not have mown you could not have mown they could not have mown
V-ing perfect
I could not have been mowing you could not have been mowing he could not have been mowing we could not have been mowing you could not have been mowing they could not have been mowing
Interrogative form
Simple form
could I mow? could you mow? could he mow? could we mow? could you mow? could they mow?
V-ing form
could I be mowing? could you be mowing? could he be mowing? could we be mowing? could you be mowing? could they be mowing?
Perfect
could I have mown? could you have mown? could he have mown? could we have mown? could you have mown? could they have mown?
V-ing perfect
could I have been mowing? could you have been mowing? could he have been mowing? could we have been mowing? could you have been mowing? could they have been mowing?
Interro-negative form
Simple form
could I not mow? could you not mow? could he not mow? could we not mow? could you not mow? could they not mow?
V-ing form
could I not be mowing? could you not be mowing? could he not be mowing? could we not be mowing? could you not be mowing? could they not be mowing?
Perfect
could I not have mown? could you not have mown? could he not have mown? could we not have mown? could you not have mown? could they not have mown?
V-ing perfect
could I not have been mowing? could you not have been mowing? could he not have been mowing? could we not have been mowing? could you not have been mowing? could they not have been mowing?