English verb conjugation
MUST BACKTRACK

Regular verb: backtrack - backtracked - backtracked

Affirmation

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