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