English verb conjugation
COULD MARCH

Regular verb: march - marched - marched

Affirmation

Simple form	V-ing form
I could march you could march she could march we could march you could march they could march	I could be marching you could be marching she 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 she 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 she 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 could not march you could not march she could not march we could not march you could not march they could not march	I could not be marching you could not be marching she could not be marching we could not be marching you could not be marching they could not be marching
Perfect	V-ing perfect
I could not have marched you could not have marched she could not have marched we could not have marched you could not have marched they could not have marched	I could not have been marching you could not have been marching she could not have been marching we could not have been marching you could not have been marching they could not have been marching

Interrogative form

Simple form	V-ing form
could I march? could you march? could she march? could we march? could you march? could they march?	could I be marching? could you be marching? could she 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 she 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 she 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
could I not march? could you not march? could she not march? could we not march? could you not march? could they not march?	could I not be marching? could you not be marching? could she not be marching? could we not be marching? could you not be marching? could they not be marching?
Perfect	V-ing perfect
could I not have marched? could you not have marched? could she not have marched? could we not have marched? could you not have marched? could they not have marched?	could I not have been marching? could you not have been marching? could she not have been marching? could we not have been marching? could you not have been marching? could they not have been marching?