English verb conjugation
MUST VACATION

Regular verb: vacation - vacationed - vacationed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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