Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could manage manage you could manage manage he could manage manage we could manage manage you could manage manage they could manage manage
V-ing form
I could be manage managing you could be manage managing he could be manage managing we could be manage managing you could be manage managing they could be manage managing
Perfect
I could have manage managed you could have manage managed he could have manage managed we could have manage managed you could have manage managed they could have manage managed
V-ing perfect
I could have been manage managing you could have been manage managing he could have been manage managing we could have been manage managing you could have been manage managing they could have been manage managing
Negation
Simple form
I could not manage manage you could not manage manage he could not manage manage we could not manage manage you could not manage manage they could not manage manage
V-ing form
I could not be manage managing you could not be manage managing he could not be manage managing we could not be manage managing you could not be manage managing they could not be manage managing
Perfect
I could not have manage managed you could not have manage managed he could not have manage managed we could not have manage managed you could not have manage managed they could not have manage managed
V-ing perfect
I could not have been manage managing you could not have been manage managing he could not have been manage managing we could not have been manage managing you could not have been manage managing they could not have been manage managing
Interrogative form
Simple form
could I manage manage? could you manage manage? could he manage manage? could we manage manage? could you manage manage? could they manage manage?
V-ing form
could I be manage managing? could you be manage managing? could he be manage managing? could we be manage managing? could you be manage managing? could they be manage managing?
Perfect
could I have manage managed? could you have manage managed? could he have manage managed? could we have manage managed? could you have manage managed? could they have manage managed?
V-ing perfect
could I have been manage managing? could you have been manage managing? could he have been manage managing? could we have been manage managing? could you have been manage managing? could they have been manage managing?
Interro-negative form
Simple form
could I not manage manage? could you not manage manage? could he not manage manage? could we not manage manage? could you not manage manage? could they not manage manage?
V-ing form
could I not be manage managing? could you not be manage managing? could he not be manage managing? could we not be manage managing? could you not be manage managing? could they not be manage managing?
Perfect
could I not have manage managed? could you not have manage managed? could he not have manage managed? could we not have manage managed? could you not have manage managed? could they not have manage managed?
V-ing perfect
could I not have been manage managing? could you not have been manage managing? could he not have been manage managing? could we not have been manage managing? could you not have been manage managing? could they not have been manage managing?