I must filter you must filter he must filter we must filter you must filter they must filter
Forma com V-ing
I must be filtering you must be filtering he must be filtering we must be filtering you must be filtering they must be filtering
Perfeito
I must have filtered you must have filtered he must have filtered we must have filtered you must have filtered they must have filtered
Perfeito com V-ing
I must have been filtering you must have been filtering he must have been filtering we must have been filtering you must have been filtering they must have been filtering
Negação
Forma simple
I must not filter you must not filter he must not filter we must not filter you must not filter they must not filter
Forma com V-ing
I must not be filtering you must not be filtering he must not be filtering we must not be filtering you must not be filtering they must not be filtering
Perfeito
I must not have filtered you must not have filtered he must not have filtered we must not have filtered you must not have filtered they must not have filtered
Perfeito com V-ing
I must not have been filtering you must not have been filtering he must not have been filtering we must not have been filtering you must not have been filtering they must not have been filtering
Forma interrogativa
Forma simple
must I filter? must you filter? must he filter? must we filter? must you filter? must they filter?
Forma com V-ing
must I be filtering? must you be filtering? must he be filtering? must we be filtering? must you be filtering? must they be filtering?
Perfeito
must I have filtered? must you have filtered? must he have filtered? must we have filtered? must you have filtered? must they have filtered?
Perfeito com V-ing
must I have been filtering? must you have been filtering? must he have been filtering? must we have been filtering? must you have been filtering? must they have been filtering?
Forma interro-Negação
Forma simple
must I not filter? must you not filter? must he not filter? must we not filter? must you not filter? must they not filter?
Forma com V-ing
must I not be filtering? must you not be filtering? must he not be filtering? must we not be filtering? must you not be filtering? must they not be filtering?
Perfeito
must I not have filtered? must you not have filtered? must he not have filtered? must we not have filtered? must you not have filtered? must they not have filtered?
Perfeito com V-ing
must I not have been filtering? must you not have been filtering? must he not have been filtering? must we not have been filtering? must you not have been filtering? must they not have been filtering?