I must rust you must rust he must rust we must rust you must rust they must rust
Forma con V-ing
I must be rusting you must be rusting he must be rusting we must be rusting you must be rusting they must be rusting
Perfecto
I must have rusted you must have rusted he must have rusted we must have rusted you must have rusted they must have rusted
Perfecto con V-ing
I must have been rusting you must have been rusting he must have been rusting we must have been rusting you must have been rusting they must have been rusting
Negación
Forma simple
I must not rust you must not rust he must not rust we must not rust you must not rust they must not rust
Forma con V-ing
I must not be rusting you must not be rusting he must not be rusting we must not be rusting you must not be rusting they must not be rusting
Perfecto
I must not have rusted you must not have rusted he must not have rusted we must not have rusted you must not have rusted they must not have rusted
Perfecto con V-ing
I must not have been rusting you must not have been rusting he must not have been rusting we must not have been rusting you must not have been rusting they must not have been rusting
Forma interrogativa
Forma simple
must I rust? must you rust? must he rust? must we rust? must you rust? must they rust?
Forma con V-ing
must I be rusting? must you be rusting? must he be rusting? must we be rusting? must you be rusting? must they be rusting?
Perfecto
must I have rusted? must you have rusted? must he have rusted? must we have rusted? must you have rusted? must they have rusted?
Perfecto con V-ing
must I have been rusting? must you have been rusting? must he have been rusting? must we have been rusting? must you have been rusting? must they have been rusting?
Forma interro-negativa
Forma simple
must I not rust? must you not rust? must he not rust? must we not rust? must you not rust? must they not rust?
Forma con V-ing
must I not be rusting? must you not be rusting? must he not be rusting? must we not be rusting? must you not be rusting? must they not be rusting?
Perfecto
must I not have rusted? must you not have rusted? must he not have rusted? must we not have rusted? must you not have rusted? must they not have rusted?
Perfecto con V-ing
must I not have been rusting? must you not have been rusting? must he not have been rusting? must we not have been rusting? must you not have been rusting? must they not have been rusting?