English verb conjugation
COULD MANAGE

Regular verb: manage - managed - managed

Affirmation

Simple form	V-ing form
I could manage you could manage he could manage we could manage you could manage they could manage	I could be managing you could be managing he could be managing we could be managing you could be managing they could be managing
Perfect	V-ing perfect
I could have managed you could have managed he could have managed we could have managed you could have managed they could have managed	I could have been managing you could have been managing he could have been managing we could have been managing you could have been managing they could have been managing

Negation

Simple form	V-ing form
I couldn't manage you couldn't manage he couldn't manage we couldn't manage you couldn't manage they couldn't manage	I couldn't be managing you couldn't be managing he couldn't be managing we couldn't be managing you couldn't be managing they couldn't be managing
Perfect	V-ing perfect
I couldn't have managed you couldn't have managed he couldn't have managed we couldn't have managed you couldn't have managed they couldn't have managed	I couldn't have been managing you couldn't have been managing he couldn't have been managing we couldn't have been managing you couldn't have been managing they couldn't have been managing

Interrogative form

Simple form	V-ing form
could I manage? could you manage? could he manage? could we manage? could you manage? could they manage?	could I be managing? could you be managing? could he be managing? could we be managing? could you be managing? could they be managing?
Perfect	V-ing perfect
could I have managed? could you have managed? could he have managed? could we have managed? could you have managed? could they have managed?	could I have been managing? could you have been managing? could he have been managing? could we have been managing? could you have been managing? could they have been managing?

Interro-negative form

Simple form	V-ing form
couldn't I manage? couldn't you manage? couldn't he manage? couldn't we manage? couldn't you manage? couldn't they manage?	couldn't I be managing? couldn't you be managing? couldn't he be managing? couldn't we be managing? couldn't you be managing? couldn't they be managing?
Perfect	V-ing perfect
couldn't I have managed? couldn't you have managed? couldn't he have managed? couldn't we have managed? couldn't you have managed? couldn't they have managed?	couldn't I have been managing? couldn't you have been managing? couldn't he have been managing? couldn't we have been managing? couldn't you have been managing? couldn't they have been managing?