I could amble you could amble he could amble we could amble you could amble they could amble
V-ing form
I could be ambling you could be ambling he could be ambling we could be ambling you could be ambling they could be ambling
Perfect
I could have ambled you could have ambled he could have ambled we could have ambled you could have ambled they could have ambled
V-ing perfect
I could have been ambling you could have been ambling he could have been ambling we could have been ambling you could have been ambling they could have been ambling
Negation
Simple form
I couldn't amble you couldn't amble he couldn't amble we couldn't amble you couldn't amble they couldn't amble
V-ing form
I couldn't be ambling you couldn't be ambling he couldn't be ambling we couldn't be ambling you couldn't be ambling they couldn't be ambling
Perfect
I couldn't have ambled you couldn't have ambled he couldn't have ambled we couldn't have ambled you couldn't have ambled they couldn't have ambled
V-ing perfect
I couldn't have been ambling you couldn't have been ambling he couldn't have been ambling we couldn't have been ambling you couldn't have been ambling they couldn't have been ambling
Interrogative form
Simple form
could I amble? could you amble? could he amble? could we amble? could you amble? could they amble?
V-ing form
could I be ambling? could you be ambling? could he be ambling? could we be ambling? could you be ambling? could they be ambling?
Perfect
could I have ambled? could you have ambled? could he have ambled? could we have ambled? could you have ambled? could they have ambled?
V-ing perfect
could I have been ambling? could you have been ambling? could he have been ambling? could we have been ambling? could you have been ambling? could they have been ambling?
Interro-negative form
Simple form
couldn't I amble? couldn't you amble? couldn't he amble? couldn't we amble? couldn't you amble? couldn't they amble?
V-ing form
couldn't I be ambling? couldn't you be ambling? couldn't he be ambling? couldn't we be ambling? couldn't you be ambling? couldn't they be ambling?
Perfect
couldn't I have ambled? couldn't you have ambled? couldn't he have ambled? couldn't we have ambled? couldn't you have ambled? couldn't they have ambled?
V-ing perfect
couldn't I have been ambling? couldn't you have been ambling? couldn't he have been ambling? couldn't we have been ambling? couldn't you have been ambling? couldn't they have been ambling?