English verb conjugation
COULD FINISH

Regular verb: finish - finished - finished

Affirmation

Simple form	V-ing form
I could finish you could finish he could finish we could finish you could finish they could finish	I could be finishing you could be finishing he could be finishing we could be finishing you could be finishing they could be finishing
Perfect	V-ing perfect
I could have finished you could have finished he could have finished we could have finished you could have finished they could have finished	I could have been finishing you could have been finishing he could have been finishing we could have been finishing you could have been finishing they could have been finishing

Negation

Simple form	V-ing form
I couldn't finish you couldn't finish he couldn't finish we couldn't finish you couldn't finish they couldn't finish	I couldn't be finishing you couldn't be finishing he couldn't be finishing we couldn't be finishing you couldn't be finishing they couldn't be finishing
Perfect	V-ing perfect
I couldn't have finished you couldn't have finished he couldn't have finished we couldn't have finished you couldn't have finished they couldn't have finished	I couldn't have been finishing you couldn't have been finishing he couldn't have been finishing we couldn't have been finishing you couldn't have been finishing they couldn't have been finishing

Interrogative form

Simple form	V-ing form
could I finish? could you finish? could he finish? could we finish? could you finish? could they finish?	could I be finishing? could you be finishing? could he be finishing? could we be finishing? could you be finishing? could they be finishing?
Perfect	V-ing perfect
could I have finished? could you have finished? could he have finished? could we have finished? could you have finished? could they have finished?	could I have been finishing? could you have been finishing? could he have been finishing? could we have been finishing? could you have been finishing? could they have been finishing?

Interro-negative form

Simple form	V-ing form
couldn't I finish? couldn't you finish? couldn't he finish? couldn't we finish? couldn't you finish? couldn't they finish?	couldn't I be finishing? couldn't you be finishing? couldn't he be finishing? couldn't we be finishing? couldn't you be finishing? couldn't they be finishing?
Perfect	V-ing perfect
couldn't I have finished? couldn't you have finished? couldn't he have finished? couldn't we have finished? couldn't you have finished? couldn't they have finished?	couldn't I have been finishing? couldn't you have been finishing? couldn't he have been finishing? couldn't we have been finishing? couldn't you have been finishing? couldn't they have been finishing?