I must dust you must dust he must dust we must dust you must dust they must dust
Forma com V-ing
I must be dusting you must be dusting he must be dusting we must be dusting you must be dusting they must be dusting
Perfeito
I must have dusted you must have dusted he must have dusted we must have dusted you must have dusted they must have dusted
Perfeito com V-ing
I must have been dusting you must have been dusting he must have been dusting we must have been dusting you must have been dusting they must have been dusting
Negação
Forma simple
I must not dust you must not dust he must not dust we must not dust you must not dust they must not dust
Forma com V-ing
I must not be dusting you must not be dusting he must not be dusting we must not be dusting you must not be dusting they must not be dusting
Perfeito
I must not have dusted you must not have dusted he must not have dusted we must not have dusted you must not have dusted they must not have dusted
Perfeito com V-ing
I must not have been dusting you must not have been dusting he must not have been dusting we must not have been dusting you must not have been dusting they must not have been dusting
Forma interrogativa
Forma simple
must I dust? must you dust? must he dust? must we dust? must you dust? must they dust?
Forma com V-ing
must I be dusting? must you be dusting? must he be dusting? must we be dusting? must you be dusting? must they be dusting?
Perfeito
must I have dusted? must you have dusted? must he have dusted? must we have dusted? must you have dusted? must they have dusted?
Perfeito com V-ing
must I have been dusting? must you have been dusting? must he have been dusting? must we have been dusting? must you have been dusting? must they have been dusting?
Forma interro-Negação
Forma simple
must I not dust? must you not dust? must he not dust? must we not dust? must you not dust? must they not dust?
Forma com V-ing
must I not be dusting? must you not be dusting? must he not be dusting? must we not be dusting? must you not be dusting? must they not be dusting?
Perfeito
must I not have dusted? must you not have dusted? must he not have dusted? must we not have dusted? must you not have dusted? must they not have dusted?
Perfeito com V-ing
must I not have been dusting? must you not have been dusting? must he not have been dusting? must we not have been dusting? must you not have been dusting? must they not have been dusting?