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