English verb conjugation
COULD FESTOON

Regular verb: festoon - festooned - festooned

Affirmation

Simple form	V-ing form
I could festoon you could festoon he could festoon we could festoon you could festoon they could festoon	I could be festooning you could be festooning he 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 he 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 he 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 couldn't festoon you couldn't festoon he couldn't festoon we couldn't festoon you couldn't festoon they couldn't festoon	I couldn't be festooning you couldn't be festooning he couldn't be festooning we couldn't be festooning you couldn't be festooning they couldn't be festooning
Perfect	V-ing perfect
I couldn't have festooned you couldn't have festooned he couldn't have festooned we couldn't have festooned you couldn't have festooned they couldn't have festooned	I couldn't have been festooning you couldn't have been festooning he couldn't have been festooning we couldn't have been festooning you couldn't have been festooning they couldn't have been festooning

Interrogative form

Simple form	V-ing form
could I festoon? could you festoon? could he festoon? could we festoon? could you festoon? could they festoon?	could I be festooning? could you be festooning? could he 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 he 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 he 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
couldn't I festoon? couldn't you festoon? couldn't he festoon? couldn't we festoon? couldn't you festoon? couldn't they festoon?	couldn't I be festooning? couldn't you be festooning? couldn't he be festooning? couldn't we be festooning? couldn't you be festooning? couldn't they be festooning?
Perfect	V-ing perfect
couldn't I have festooned? couldn't you have festooned? couldn't he have festooned? couldn't we have festooned? couldn't you have festooned? couldn't they have festooned?	couldn't I have been festooning? couldn't you have been festooning? couldn't he have been festooning? couldn't we have been festooning? couldn't you have been festooning? couldn't they have been festooning?