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