must backtrack
Regular verb: backtrack - backtracked- backtracked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must backtrack
you must backtrack
she must backtrack
we must backtrack
you must backtrack
they must backtrack 	I must be backtracking
you must be backtracking
she must be backtracking
we must be backtracking
you must be backtracking
they must be backtracking	I must have backtracked
you must have backtracked
she must have backtracked
we must have backtracked
you must have backtracked
they must have backtracked	I must have been backtracking
you must have been backtracking
she must have been backtracking
we must have been backtracking
you must have been backtracking
they must have been backtracking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not backtrack
you must not backtrack
she must not backtrack
we must not backtrack
you must not backtrack
they must not backtrack 	I must not be backtracking
you must not be backtracking
she must not be backtracking
we must not be backtracking
you must not be backtracking
they must not be backtracking	I must not have backtracked
you must not have backtracked
she must not have backtracked
we must not have backtracked
you must not have backtracked
they must not have backtracked	I must not have been backtracking
you must not have been backtracking
she must not have been backtracking
we must not have been backtracking
you must not have been backtracking
they must not have been backtracking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I backtrack?
must you backtrack?
must she backtrack?
must we backtrack?
must you backtrack?
must they backtrack? 	must I be backtracking?
must you be backtracking?
must she be backtracking?
must we be backtracking?
must you be backtracking?
must they be backtracking? 	must I have backtracked?
must you have backtracked?
must she have backtracked?
must we have backtracked?
must you have backtracked?
must they have backtracked? 	must I have been backtracking?
must you have been backtracking?
must she have been backtracking?
must we have been backtracking?
must you have been backtracking?
must they have been backtracking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not backtrack?
must you not backtrack?
must she not backtrack?
must we not backtrack?
must you not backtrack?
must they not backtrack? 	must I not be backtracking?
must you not be backtracking?
must she not be backtracking?
must we not be backtracking?
must you not be backtracking?
must they not be backtracking? 	must I not have backtracked?
must you not have backtracked?
must she not have backtracked?
must we not have backtracked?
must you not have backtracked?
must they not have backtracked? 	must I not have been backtracking?
must you not have been backtracking?
must she not have been backtracking?
must we not have been backtracking?
must you not have been backtracking?
must they not have been backtracking?