I must crust you must crust she must crust we must crust you must crust they must crust
Forma con V-ing
I must be crusting you must be crusting she must be crusting we must be crusting you must be crusting they must be crusting
Perfecto
I must have crusted you must have crusted she must have crusted we must have crusted you must have crusted they must have crusted
Perfecto con V-ing
I must have been crusting you must have been crusting she must have been crusting we must have been crusting you must have been crusting they must have been crusting
Negación
Forma simple
I must not crust you must not crust she must not crust we must not crust you must not crust they must not crust
Forma con V-ing
I must not be crusting you must not be crusting she must not be crusting we must not be crusting you must not be crusting they must not be crusting
Perfecto
I must not have crusted you must not have crusted she must not have crusted we must not have crusted you must not have crusted they must not have crusted
Perfecto con V-ing
I must not have been crusting you must not have been crusting she must not have been crusting we must not have been crusting you must not have been crusting they must not have been crusting
Forma interrogativa
Forma simple
must I crust? must you crust? must she crust? must we crust? must you crust? must they crust?
Forma con V-ing
must I be crusting? must you be crusting? must she be crusting? must we be crusting? must you be crusting? must they be crusting?
Perfecto
must I have crusted? must you have crusted? must she have crusted? must we have crusted? must you have crusted? must they have crusted?
Perfecto con V-ing
must I have been crusting? must you have been crusting? must she have been crusting? must we have been crusting? must you have been crusting? must they have been crusting?
Forma interro-negativa
Forma simple
must I not crust? must you not crust? must she not crust? must we not crust? must you not crust? must they not crust?
Forma con V-ing
must I not be crusting? must you not be crusting? must she not be crusting? must we not be crusting? must you not be crusting? must they not be crusting?
Perfecto
must I not have crusted? must you not have crusted? must she not have crusted? must we not have crusted? must you not have crusted? must they not have crusted?
Perfecto con V-ing
must I not have been crusting? must you not have been crusting? must she not have been crusting? must we not have been crusting? must you not have been crusting? must they not have been crusting?