I could perambulate you could perambulate he could perambulate we could perambulate you could perambulate they could perambulate
V-ing form
I could be perambulating you could be perambulating he could be perambulating we could be perambulating you could be perambulating they could be perambulating
Perfect
I could have perambulated you could have perambulated he could have perambulated we could have perambulated you could have perambulated they could have perambulated
V-ing perfect
I could have been perambulating you could have been perambulating he could have been perambulating we could have been perambulating you could have been perambulating they could have been perambulating
Negation
Simple form
I could not perambulate you could not perambulate he could not perambulate we could not perambulate you could not perambulate they could not perambulate
V-ing form
I could not be perambulating you could not be perambulating he could not be perambulating we could not be perambulating you could not be perambulating they could not be perambulating
Perfect
I could not have perambulated you could not have perambulated he could not have perambulated we could not have perambulated you could not have perambulated they could not have perambulated
V-ing perfect
I could not have been perambulating you could not have been perambulating he could not have been perambulating we could not have been perambulating you could not have been perambulating they could not have been perambulating
Interrogative form
Simple form
could I perambulate? could you perambulate? could he perambulate? could we perambulate? could you perambulate? could they perambulate?
V-ing form
could I be perambulating? could you be perambulating? could he be perambulating? could we be perambulating? could you be perambulating? could they be perambulating?
Perfect
could I have perambulated? could you have perambulated? could he have perambulated? could we have perambulated? could you have perambulated? could they have perambulated?
V-ing perfect
could I have been perambulating? could you have been perambulating? could he have been perambulating? could we have been perambulating? could you have been perambulating? could they have been perambulating?
Interro-negative form
Simple form
could I not perambulate? could you not perambulate? could he not perambulate? could we not perambulate? could you not perambulate? could they not perambulate?
V-ing form
could I not be perambulating? could you not be perambulating? could he not be perambulating? could we not be perambulating? could you not be perambulating? could they not be perambulating?
Perfect
could I not have perambulated? could you not have perambulated? could he not have perambulated? could we not have perambulated? could you not have perambulated? could they not have perambulated?
V-ing perfect
could I not have been perambulating? could you not have been perambulating? could he not have been perambulating? could we not have been perambulating? could you not have been perambulating? could they not have been perambulating?