I could clone you could clone he could clone we could clone you could clone they could clone
V-ing form
I could be cloning you could be cloning he could be cloning we could be cloning you could be cloning they could be cloning
Perfect
I could have cloned you could have cloned he could have cloned we could have cloned you could have cloned they could have cloned
V-ing perfect
I could have been cloning you could have been cloning he could have been cloning we could have been cloning you could have been cloning they could have been cloning
Negation
Simple form
I couldn't clone you couldn't clone he couldn't clone we couldn't clone you couldn't clone they couldn't clone
V-ing form
I couldn't be cloning you couldn't be cloning he couldn't be cloning we couldn't be cloning you couldn't be cloning they couldn't be cloning
Perfect
I couldn't have cloned you couldn't have cloned he couldn't have cloned we couldn't have cloned you couldn't have cloned they couldn't have cloned
V-ing perfect
I couldn't have been cloning you couldn't have been cloning he couldn't have been cloning we couldn't have been cloning you couldn't have been cloning they couldn't have been cloning
Interrogative form
Simple form
could I clone? could you clone? could he clone? could we clone? could you clone? could they clone?
V-ing form
could I be cloning? could you be cloning? could he be cloning? could we be cloning? could you be cloning? could they be cloning?
Perfect
could I have cloned? could you have cloned? could he have cloned? could we have cloned? could you have cloned? could they have cloned?
V-ing perfect
could I have been cloning? could you have been cloning? could he have been cloning? could we have been cloning? could you have been cloning? could they have been cloning?
Interro-negative form
Simple form
couldn't I clone? couldn't you clone? couldn't he clone? couldn't we clone? couldn't you clone? couldn't they clone?
V-ing form
couldn't I be cloning? couldn't you be cloning? couldn't he be cloning? couldn't we be cloning? couldn't you be cloning? couldn't they be cloning?
Perfect
couldn't I have cloned? couldn't you have cloned? couldn't he have cloned? couldn't we have cloned? couldn't you have cloned? couldn't they have cloned?
V-ing perfect
couldn't I have been cloning? couldn't you have been cloning? couldn't he have been cloning? couldn't we have been cloning? couldn't you have been cloning? couldn't they have been cloning?