English verb conjugation
MUST SHIFT

Regular verb: shift - shifted - shifted

Affirmation

Simple form	V-ing form
I must shift you must shift she must shift we must shift you must shift they must shift	I must be shifting you must be shifting she must be shifting we must be shifting you must be shifting they must be shifting
Perfect	V-ing perfect
I must have shifted you must have shifted she must have shifted we must have shifted you must have shifted they must have shifted	I must have been shifting you must have been shifting she must have been shifting we must have been shifting you must have been shifting they must have been shifting

Negation

Simple form	V-ing form
I must not shift you must not shift she must not shift we must not shift you must not shift they must not shift	I must not be shifting you must not be shifting she must not be shifting we must not be shifting you must not be shifting they must not be shifting
Perfect	V-ing perfect
I must not have shifted you must not have shifted she must not have shifted we must not have shifted you must not have shifted they must not have shifted	I must not have been shifting you must not have been shifting she must not have been shifting we must not have been shifting you must not have been shifting they must not have been shifting

Interrogative form

Simple form	V-ing form
must I shift? must you shift? must she shift? must we shift? must you shift? must they shift?	must I be shifting? must you be shifting? must she be shifting? must we be shifting? must you be shifting? must they be shifting?
Perfect	V-ing perfect
must I have shifted? must you have shifted? must she have shifted? must we have shifted? must you have shifted? must they have shifted?	must I have been shifting? must you have been shifting? must she have been shifting? must we have been shifting? must you have been shifting? must they have been shifting?

Interro-negative form

Simple form	V-ing form
must I not shift? must you not shift? must she not shift? must we not shift? must you not shift? must they not shift?	must I not be shifting? must you not be shifting? must she not be shifting? must we not be shifting? must you not be shifting? must they not be shifting?
Perfect	V-ing perfect
must I not have shifted? must you not have shifted? must she not have shifted? must we not have shifted? must you not have shifted? must they not have shifted?	must I not have been shifting? must you not have been shifting? must she not have been shifting? must we not have been shifting? must you not have been shifting? must they not have been shifting?