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