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 mustn't backtrack you mustn't backtrack he mustn't backtrack we mustn't backtrack you mustn't backtrack they mustn't backtrack	I mustn't be backtracking you mustn't be backtracking he mustn't be backtracking we mustn't be backtracking you mustn't be backtracking they mustn't be backtracking
Perfect	V-ing perfect
I mustn't have backtracked you mustn't have backtracked he mustn't have backtracked we mustn't have backtracked you mustn't have backtracked they mustn't have backtracked	I mustn't have been backtracking you mustn't have been backtracking he mustn't have been backtracking we mustn't have been backtracking you mustn't have been backtracking they mustn't 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
mustn't I backtrack? mustn't you backtrack? mustn't he backtrack? mustn't we backtrack? mustn't you backtrack? mustn't they backtrack?	mustn't I be backtracking? mustn't you be backtracking? mustn't he be backtracking? mustn't we be backtracking? mustn't you be backtracking? mustn't they be backtracking?
Perfect	V-ing perfect
mustn't I have backtracked? mustn't you have backtracked? mustn't he have backtracked? mustn't we have backtracked? mustn't you have backtracked? mustn't they have backtracked?	mustn't I have been backtracking? mustn't you have been backtracking? mustn't he have been backtracking? mustn't we have been backtracking? mustn't you have been backtracking? mustn't they have been backtracking?