English verb conjugation
COULD VACATION

Regular verb: vacation - vacationed - vacationed

Affirmation

Simple form	V-ing form
I could vacation you could vacation she could vacation we could vacation you could vacation they could vacation	I could be vacationing you could be vacationing she 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 she 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 she 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 could not vacation you could not vacation she could not vacation we could not vacation you could not vacation they could not vacation	I could not be vacationing you could not be vacationing she could not be vacationing we could not be vacationing you could not be vacationing they could not be vacationing
Perfect	V-ing perfect
I could not have vacationed you could not have vacationed she could not have vacationed we could not have vacationed you could not have vacationed they could not have vacationed	I could not have been vacationing you could not have been vacationing she could not have been vacationing we could not have been vacationing you could not have been vacationing they could not have been vacationing

Interrogative form

Simple form	V-ing form
could I vacation? could you vacation? could she vacation? could we vacation? could you vacation? could they vacation?	could I be vacationing? could you be vacationing? could she 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 she 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 she 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
could I not vacation? could you not vacation? could she not vacation? could we not vacation? could you not vacation? could they not vacation?	could I not be vacationing? could you not be vacationing? could she not be vacationing? could we not be vacationing? could you not be vacationing? could they not be vacationing?
Perfect	V-ing perfect
could I not have vacationed? could you not have vacationed? could she not have vacationed? could we not have vacationed? could you not have vacationed? could they not have vacationed?	could I not have been vacationing? could you not have been vacationing? could she not have been vacationing? could we not have been vacationing? could you not have been vacationing? could they not have been vacationing?