must vacation
Regular verb: vacation - vacationed- vacationed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vacation
you must vacation
she must vacation
we must vacation
you must vacation
they must vacation 	I must be vacationing
you must be vacationing
she must be vacationing
we must be vacationing
you must be vacationing
they must be vacationing	I must have vacationed
you must have vacationed
she 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
she 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 	Perfect 	V-ing perfect 	
I mustn't vacation
you mustn't vacation
she mustn't vacation
we mustn't vacation
you mustn't vacation
they mustn't vacation 	I mustn't be vacationing
you mustn't be vacationing
she mustn't be vacationing
we mustn't be vacationing
you mustn't be vacationing
they mustn't be vacationing	I mustn't have vacationed
you mustn't have vacationed
she mustn't have vacationed
we mustn't have vacationed
you mustn't have vacationed
they mustn't have vacationed	I mustn't have been vacationing
you mustn't have been vacationing
she mustn't have been vacationing
we mustn't have been vacationing
you mustn't have been vacationing
they mustn't have been vacationing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vacation?
must you vacation?
must she vacation?
must we vacation?
must you vacation?
must they vacation? 	must I be vacationing?
must you be vacationing?
must she be vacationing?
must we be vacationing?
must you be vacationing?
must they be vacationing? 	must I have vacationed?
must you have vacationed?
must she 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 she 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 	Perfect 	V-ing perfect 	
mustn't I vacation?
mustn't you vacation?
mustn't she vacation?
mustn't we vacation?
mustn't you vacation?
mustn't they vacation? 	mustn't I be vacationing?
mustn't you be vacationing?
mustn't she be vacationing?
mustn't we be vacationing?
mustn't you be vacationing?
mustn't they be vacationing? 	mustn't I have vacationed?
mustn't you have vacationed?
mustn't she have vacationed?
mustn't we have vacationed?
mustn't you have vacationed?
mustn't they have vacationed? 	mustn't I have been vacationing?
mustn't you have been vacationing?
mustn't she have been vacationing?
mustn't we have been vacationing?
mustn't you have been vacationing?
mustn't they have been vacationing?