English verb conjugation
COULD FESTOON

Regular verb: festoon - festooned - festooned

Affirmation

Simple form	V-ing form
I could festoon you could festoon she could festoon we could festoon you could festoon they could festoon	I could be festooning you could be festooning she could be festooning we could be festooning you could be festooning they could be festooning
Perfect	V-ing perfect
I could have festooned you could have festooned she could have festooned we could have festooned you could have festooned they could have festooned	I could have been festooning you could have been festooning she could have been festooning we could have been festooning you could have been festooning they could have been festooning

Negation

Simple form	V-ing form
I could not festoon you could not festoon she could not festoon we could not festoon you could not festoon they could not festoon	I could not be festooning you could not be festooning she could not be festooning we could not be festooning you could not be festooning they could not be festooning
Perfect	V-ing perfect
I could not have festooned you could not have festooned she could not have festooned we could not have festooned you could not have festooned they could not have festooned	I could not have been festooning you could not have been festooning she could not have been festooning we could not have been festooning you could not have been festooning they could not have been festooning

Interrogative form

Simple form	V-ing form
could I festoon? could you festoon? could she festoon? could we festoon? could you festoon? could they festoon?	could I be festooning? could you be festooning? could she be festooning? could we be festooning? could you be festooning? could they be festooning?
Perfect	V-ing perfect
could I have festooned? could you have festooned? could she have festooned? could we have festooned? could you have festooned? could they have festooned?	could I have been festooning? could you have been festooning? could she have been festooning? could we have been festooning? could you have been festooning? could they have been festooning?

Interro-negative form

Simple form	V-ing form
could I not festoon? could you not festoon? could she not festoon? could we not festoon? could you not festoon? could they not festoon?	could I not be festooning? could you not be festooning? could she not be festooning? could we not be festooning? could you not be festooning? could they not be festooning?
Perfect	V-ing perfect
could I not have festooned? could you not have festooned? could she not have festooned? could we not have festooned? could you not have festooned? could they not have festooned?	could I not have been festooning? could you not have been festooning? could she not have been festooning? could we not have been festooning? could you not have been festooning? could they not have been festooning?