must backpack
Regular verb: backpack - backpacked- backpacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must backpack
you must backpack
she must backpack
we must backpack
you must backpack
they must backpack 	I must be backpacking
you must be backpacking
she must be backpacking
we must be backpacking
you must be backpacking
they must be backpacking	I must have backpacked
you must have backpacked
she 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
she must have been backpacking
we must have been backpacking
you must have been backpacking
they must have been backpacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't backpack
you mustn't backpack
she 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
she 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
she 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
she mustn't have been backpacking
we mustn't have been backpacking
you mustn't have been backpacking
they mustn't have been backpacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I backpack?
must you backpack?
must she backpack?
must we backpack?
must you backpack?
must they backpack? 	must I be backpacking?
must you be backpacking?
must she be backpacking?
must we be backpacking?
must you be backpacking?
must they be backpacking? 	must I have backpacked?
must you have backpacked?
must she 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 she have been backpacking?
must we have been backpacking?
must you have been backpacking?
must they have been backpacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I backpack?
mustn't you backpack?
mustn't she 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 she 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 she 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 she have been backpacking?
mustn't we have been backpacking?
mustn't you have been backpacking?
mustn't they have been backpacking?