I could mow you could mow she could mow we could mow you could mow they could mow
V-ing form
I could be mowing you could be mowing she could be mowing we could be mowing you could be mowing they could be mowing
Perfect
I could have mown you could have mown she 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 she could have been mowing we could have been mowing you could have been mowing they could have been mowing
Negation
Simple form
I couldn't mow you couldn't mow she couldn't mow we couldn't mow you couldn't mow they couldn't mow
V-ing form
I couldn't be mowing you couldn't be mowing she couldn't be mowing we couldn't be mowing you couldn't be mowing they couldn't be mowing
Perfect
I couldn't have mown you couldn't have mown she couldn't have mown we couldn't have mown you couldn't have mown they couldn't have mown
V-ing perfect
I couldn't have been mowing you couldn't have been mowing she couldn't have been mowing we couldn't have been mowing you couldn't have been mowing they couldn't have been mowing
Interrogative form
Simple form
could I mow? could you mow? could she mow? could we mow? could you mow? could they mow?
V-ing form
could I be mowing? could you be mowing? could she be mowing? could we be mowing? could you be mowing? could they be mowing?
Perfect
could I have mown? could you have mown? could she 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 she have been mowing? could we have been mowing? could you have been mowing? could they have been mowing?
Interro-negative form
Simple form
couldn't I mow? couldn't you mow? couldn't she mow? couldn't we mow? couldn't you mow? couldn't they mow?
V-ing form
couldn't I be mowing? couldn't you be mowing? couldn't she be mowing? couldn't we be mowing? couldn't you be mowing? couldn't they be mowing?
Perfect
couldn't I have mown? couldn't you have mown? couldn't she have mown? couldn't we have mown? couldn't you have mown? couldn't they have mown?
V-ing perfect
couldn't I have been mowing? couldn't you have been mowing? couldn't she have been mowing? couldn't we have been mowing? couldn't you have been mowing? couldn't they have been mowing?