English verb conjugation
COULD MARCH

Regular verb: march - marched - marched

Affirmation

Simple form	V-ing form
I could march you could march he could march we could march you could march they could march	I could be marching you could be marching he could be marching we could be marching you could be marching they could be marching
Perfect	V-ing perfect
I could have marched you could have marched he could have marched we could have marched you could have marched they could have marched	I could have been marching you could have been marching he could have been marching we could have been marching you could have been marching they could have been marching

Negation

Simple form	V-ing form
I couldn't march you couldn't march he couldn't march we couldn't march you couldn't march they couldn't march	I couldn't be marching you couldn't be marching he couldn't be marching we couldn't be marching you couldn't be marching they couldn't be marching
Perfect	V-ing perfect
I couldn't have marched you couldn't have marched he couldn't have marched we couldn't have marched you couldn't have marched they couldn't have marched	I couldn't have been marching you couldn't have been marching he couldn't have been marching we couldn't have been marching you couldn't have been marching they couldn't have been marching

Interrogative form

Simple form	V-ing form
could I march? could you march? could he march? could we march? could you march? could they march?	could I be marching? could you be marching? could he be marching? could we be marching? could you be marching? could they be marching?
Perfect	V-ing perfect
could I have marched? could you have marched? could he have marched? could we have marched? could you have marched? could they have marched?	could I have been marching? could you have been marching? could he have been marching? could we have been marching? could you have been marching? could they have been marching?

Interro-negative form

Simple form	V-ing form
couldn't I march? couldn't you march? couldn't he march? couldn't we march? couldn't you march? couldn't they march?	couldn't I be marching? couldn't you be marching? couldn't he be marching? couldn't we be marching? couldn't you be marching? couldn't they be marching?
Perfect	V-ing perfect
couldn't I have marched? couldn't you have marched? couldn't he have marched? couldn't we have marched? couldn't you have marched? couldn't they have marched?	couldn't I have been marching? couldn't you have been marching? couldn't he have been marching? couldn't we have been marching? couldn't you have been marching? couldn't they have been marching?