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 couldn't perambulate you couldn't perambulate he couldn't perambulate we couldn't perambulate you couldn't perambulate they couldn't perambulate
V-ing form
I couldn't be perambulating you couldn't be perambulating he couldn't be perambulating we couldn't be perambulating you couldn't be perambulating they couldn't be perambulating
Perfect
I couldn't have perambulated you couldn't have perambulated he couldn't have perambulated we couldn't have perambulated you couldn't have perambulated they couldn't have perambulated
V-ing perfect
I couldn't have been perambulating you couldn't have been perambulating he couldn't have been perambulating we couldn't have been perambulating you couldn't have been perambulating they couldn't 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
couldn't I perambulate? couldn't you perambulate? couldn't he perambulate? couldn't we perambulate? couldn't you perambulate? couldn't they perambulate?
V-ing form
couldn't I be perambulating? couldn't you be perambulating? couldn't he be perambulating? couldn't we be perambulating? couldn't you be perambulating? couldn't they be perambulating?
Perfect
couldn't I have perambulated? couldn't you have perambulated? couldn't he have perambulated? couldn't we have perambulated? couldn't you have perambulated? couldn't they have perambulated?
V-ing perfect
couldn't I have been perambulating? couldn't you have been perambulating? couldn't he have been perambulating? couldn't we have been perambulating? couldn't you have been perambulating? couldn't they have been perambulating?