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