English verb conjugation
COULD VACATION

Regular verb: vacation - vacationed - vacationed

Affirmation

Simple form	V-ing form
I could vacation you could vacation he could vacation we could vacation you could vacation they could vacation	I could be vacationing you could be vacationing he could be vacationing we could be vacationing you could be vacationing they could be vacationing
Perfect	V-ing perfect
I could have vacationed you could have vacationed he could have vacationed we could have vacationed you could have vacationed they could have vacationed	I could have been vacationing you could have been vacationing he could have been vacationing we could have been vacationing you could have been vacationing they could have been vacationing

Negation

Simple form	V-ing form
I couldn't vacation you couldn't vacation he couldn't vacation we couldn't vacation you couldn't vacation they couldn't vacation	I couldn't be vacationing you couldn't be vacationing he couldn't be vacationing we couldn't be vacationing you couldn't be vacationing they couldn't be vacationing
Perfect	V-ing perfect
I couldn't have vacationed you couldn't have vacationed he couldn't have vacationed we couldn't have vacationed you couldn't have vacationed they couldn't have vacationed	I couldn't have been vacationing you couldn't have been vacationing he couldn't have been vacationing we couldn't have been vacationing you couldn't have been vacationing they couldn't have been vacationing

Interrogative form

Simple form	V-ing form
could I vacation? could you vacation? could he vacation? could we vacation? could you vacation? could they vacation?	could I be vacationing? could you be vacationing? could he be vacationing? could we be vacationing? could you be vacationing? could they be vacationing?
Perfect	V-ing perfect
could I have vacationed? could you have vacationed? could he have vacationed? could we have vacationed? could you have vacationed? could they have vacationed?	could I have been vacationing? could you have been vacationing? could he have been vacationing? could we have been vacationing? could you have been vacationing? could they have been vacationing?

Interro-negative form

Simple form	V-ing form
couldn't I vacation? couldn't you vacation? couldn't he vacation? couldn't we vacation? couldn't you vacation? couldn't they vacation?	couldn't I be vacationing? couldn't you be vacationing? couldn't he be vacationing? couldn't we be vacationing? couldn't you be vacationing? couldn't they be vacationing?
Perfect	V-ing perfect
couldn't I have vacationed? couldn't you have vacationed? couldn't he have vacationed? couldn't we have vacationed? couldn't you have vacationed? couldn't they have vacationed?	couldn't I have been vacationing? couldn't you have been vacationing? couldn't he have been vacationing? couldn't we have been vacationing? couldn't you have been vacationing? couldn't they have been vacationing?