must vacation
Verbo regular: vacation - vacationed- vacationed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't vacation
you mustn't vacation
he 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
he 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
he 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
he mustn't have been vacationing
we mustn't have been vacationing
you mustn't have been vacationing
they mustn't have been vacationing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I vacation?
mustn't you vacation?
mustn't he 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 he 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 he 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 he have been vacationing?
mustn't we have been vacationing?
mustn't you have been vacationing?
mustn't they have been vacationing?