I could mine you could mine he could mine we could mine you could mine they could mine
V-ing form
I could be mining you could be mining he could be mining we could be mining you could be mining they could be mining
Perfect
I could have mined you could have mined he could have mined we could have mined you could have mined they could have mined
V-ing perfect
I could have been mining you could have been mining he could have been mining we could have been mining you could have been mining they could have been mining
Negation
Simple form
I could not mine you could not mine he could not mine we could not mine you could not mine they could not mine
V-ing form
I could not be mining you could not be mining he could not be mining we could not be mining you could not be mining they could not be mining
Perfect
I could not have mined you could not have mined he could not have mined we could not have mined you could not have mined they could not have mined
V-ing perfect
I could not have been mining you could not have been mining he could not have been mining we could not have been mining you could not have been mining they could not have been mining
Interrogative form
Simple form
could I mine? could you mine? could he mine? could we mine? could you mine? could they mine?
V-ing form
could I be mining? could you be mining? could he be mining? could we be mining? could you be mining? could they be mining?
Perfect
could I have mined? could you have mined? could he have mined? could we have mined? could you have mined? could they have mined?
V-ing perfect
could I have been mining? could you have been mining? could he have been mining? could we have been mining? could you have been mining? could they have been mining?
Interro-negative form
Simple form
could I not mine? could you not mine? could he not mine? could we not mine? could you not mine? could they not mine?
V-ing form
could I not be mining? could you not be mining? could he not be mining? could we not be mining? could you not be mining? could they not be mining?
Perfect
could I not have mined? could you not have mined? could he not have mined? could we not have mined? could you not have mined? could they not have mined?
V-ing perfect
could I not have been mining? could you not have been mining? could he not have been mining? could we not have been mining? could you not have been mining? could they not have been mining?