English verb conjugation
MUST SHIFT

Regular verb: shift - shifted - shifted

Affirmation

Simple form	V-ing form
I must shift you must shift he must shift we must shift you must shift they must shift	I must be shifting you must be shifting he 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 he 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 he 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 mustn't shift you mustn't shift he mustn't shift we mustn't shift you mustn't shift they mustn't shift	I mustn't be shifting you mustn't be shifting he mustn't be shifting we mustn't be shifting you mustn't be shifting they mustn't be shifting
Perfect	V-ing perfect
I mustn't have shifted you mustn't have shifted he mustn't have shifted we mustn't have shifted you mustn't have shifted they mustn't have shifted	I mustn't have been shifting you mustn't have been shifting he mustn't have been shifting we mustn't have been shifting you mustn't have been shifting they mustn't have been shifting

Interrogative form

Simple form	V-ing form
must I shift? must you shift? must he shift? must we shift? must you shift? must they shift?	must I be shifting? must you be shifting? must he 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 he 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 he 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
mustn't I shift? mustn't you shift? mustn't he shift? mustn't we shift? mustn't you shift? mustn't they shift?	mustn't I be shifting? mustn't you be shifting? mustn't he be shifting? mustn't we be shifting? mustn't you be shifting? mustn't they be shifting?
Perfect	V-ing perfect
mustn't I have shifted? mustn't you have shifted? mustn't he have shifted? mustn't we have shifted? mustn't you have shifted? mustn't they have shifted?	mustn't I have been shifting? mustn't you have been shifting? mustn't he have been shifting? mustn't we have been shifting? mustn't you have been shifting? mustn't they have been shifting?