I could populate you could populate he could populate we could populate you could populate they could populate
V-ing form
I could be populating you could be populating he could be populating we could be populating you could be populating they could be populating
Perfect
I could have populated you could have populated he could have populated we could have populated you could have populated they could have populated
V-ing perfect
I could have been populating you could have been populating he could have been populating we could have been populating you could have been populating they could have been populating
Negation
Simple form
I could not populate you could not populate he could not populate we could not populate you could not populate they could not populate
V-ing form
I could not be populating you could not be populating he could not be populating we could not be populating you could not be populating they could not be populating
Perfect
I could not have populated you could not have populated he could not have populated we could not have populated you could not have populated they could not have populated
V-ing perfect
I could not have been populating you could not have been populating he could not have been populating we could not have been populating you could not have been populating they could not have been populating
Interrogative form
Simple form
could I populate? could you populate? could he populate? could we populate? could you populate? could they populate?
V-ing form
could I be populating? could you be populating? could he be populating? could we be populating? could you be populating? could they be populating?
Perfect
could I have populated? could you have populated? could he have populated? could we have populated? could you have populated? could they have populated?
V-ing perfect
could I have been populating? could you have been populating? could he have been populating? could we have been populating? could you have been populating? could they have been populating?
Interro-negative form
Simple form
could I not populate? could you not populate? could he not populate? could we not populate? could you not populate? could they not populate?
V-ing form
could I not be populating? could you not be populating? could he not be populating? could we not be populating? could you not be populating? could they not be populating?
Perfect
could I not have populated? could you not have populated? could he not have populated? could we not have populated? could you not have populated? could they not have populated?
V-ing perfect
could I not have been populating? could you not have been populating? could he not have been populating? could we not have been populating? could you not have been populating? could they not have been populating?