must backpack
Verbo regular: backpack - backpacked- backpacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must backpack
you must backpack
he must backpack
we must backpack
you must backpack
they must backpack 	I must be backpacking
you must be backpacking
he must be backpacking
we must be backpacking
you must be backpacking
they must be backpacking	I must have backpacked
you must have backpacked
he must have backpacked
we must have backpacked
you must have backpacked
they must have backpacked	I must have been backpacking
you must have been backpacking
he must have been backpacking
we must have been backpacking
you must have been backpacking
they must have been backpacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't backpack
you mustn't backpack
he mustn't backpack
we mustn't backpack
you mustn't backpack
they mustn't backpack 	I mustn't be backpacking
you mustn't be backpacking
he mustn't be backpacking
we mustn't be backpacking
you mustn't be backpacking
they mustn't be backpacking	I mustn't have backpacked
you mustn't have backpacked
he mustn't have backpacked
we mustn't have backpacked
you mustn't have backpacked
they mustn't have backpacked	I mustn't have been backpacking
you mustn't have been backpacking
he mustn't have been backpacking
we mustn't have been backpacking
you mustn't have been backpacking
they mustn't have been backpacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I backpack?
must you backpack?
must he backpack?
must we backpack?
must you backpack?
must they backpack? 	must I be backpacking?
must you be backpacking?
must he be backpacking?
must we be backpacking?
must you be backpacking?
must they be backpacking? 	must I have backpacked?
must you have backpacked?
must he have backpacked?
must we have backpacked?
must you have backpacked?
must they have backpacked? 	must I have been backpacking?
must you have been backpacking?
must he have been backpacking?
must we have been backpacking?
must you have been backpacking?
must they have been backpacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I backpack?
mustn't you backpack?
mustn't he backpack?
mustn't we backpack?
mustn't you backpack?
mustn't they backpack? 	mustn't I be backpacking?
mustn't you be backpacking?
mustn't he be backpacking?
mustn't we be backpacking?
mustn't you be backpacking?
mustn't they be backpacking? 	mustn't I have backpacked?
mustn't you have backpacked?
mustn't he have backpacked?
mustn't we have backpacked?
mustn't you have backpacked?
mustn't they have backpacked? 	mustn't I have been backpacking?
mustn't you have been backpacking?
mustn't he have been backpacking?
mustn't we have been backpacking?
mustn't you have been backpacking?
mustn't they have been backpacking?