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