I must shift you must shift she must shift we must shift you must shift they must shift
Forma con V-ing
I must be shifting you must be shifting she must be shifting we must be shifting you must be shifting they must be shifting
Perfecto
I must have shifted you must have shifted she must have shifted we must have shifted you must have shifted they must have shifted
Perfecto con V-ing
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
Negación
Forma simple
I must not shift you must not shift she must not shift we must not shift you must not shift they must not shift
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
must I shift? must you shift? must she shift? must we shift? must you shift? must they shift?
Forma con V-ing
must I be shifting? must you be shifting? must she be shifting? must we be shifting? must you be shifting? must they be shifting?
Perfecto
must I have shifted? must you have shifted? must she have shifted? must we have shifted? must you have shifted? must they have shifted?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
must I not shift? must you not shift? must she not shift? must we not shift? must you not shift? must they not shift?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?