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 could not bathe you could not bathe he could not bathe we could not bathe you could not bathe they could not bathe
V-ing form
I could not be bathing you could not be bathing he could not be bathing we could not be bathing you could not be bathing they could not be bathing
Perfect
I could not have bathed you could not have bathed he could not have bathed we could not have bathed you could not have bathed they could not have bathed
V-ing perfect
I could not have been bathing you could not have been bathing he could not have been bathing we could not have been bathing you could not have been bathing they could not 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
could I not bathe? could you not bathe? could he not bathe? could we not bathe? could you not bathe? could they not bathe?
V-ing form
could I not be bathing? could you not be bathing? could he not be bathing? could we not be bathing? could you not be bathing? could they not be bathing?
Perfect
could I not have bathed? could you not have bathed? could he not have bathed? could we not have bathed? could you not have bathed? could they not have bathed?
V-ing perfect
could I not have been bathing? could you not have been bathing? could he not have been bathing? could we not have been bathing? could you not have been bathing? could they not have been bathing?