I must alert you must alert he must alert we must alert you must alert they must alert
Forma con V-ing
I must be alerting you must be alerting he must be alerting we must be alerting you must be alerting they must be alerting
Perfecto
I must have alerted you must have alerted he must have alerted we must have alerted you must have alerted they must have alerted
Perfecto con V-ing
I must have been alerting you must have been alerting he must have been alerting we must have been alerting you must have been alerting they must have been alerting
Negación
Forma simple
I must not alert you must not alert he must not alert we must not alert you must not alert they must not alert
Forma con V-ing
I must not be alerting you must not be alerting he must not be alerting we must not be alerting you must not be alerting they must not be alerting
Perfecto
I must not have alerted you must not have alerted he must not have alerted we must not have alerted you must not have alerted they must not have alerted
Perfecto con V-ing
I must not have been alerting you must not have been alerting he must not have been alerting we must not have been alerting you must not have been alerting they must not have been alerting
Forma interrogativa
Forma simple
must I alert? must you alert? must he alert? must we alert? must you alert? must they alert?
Forma con V-ing
must I be alerting? must you be alerting? must he be alerting? must we be alerting? must you be alerting? must they be alerting?
Perfecto
must I have alerted? must you have alerted? must he have alerted? must we have alerted? must you have alerted? must they have alerted?
Perfecto con V-ing
must I have been alerting? must you have been alerting? must he have been alerting? must we have been alerting? must you have been alerting? must they have been alerting?
Forma interro-negativa
Forma simple
must I not alert? must you not alert? must he not alert? must we not alert? must you not alert? must they not alert?
Forma con V-ing
must I not be alerting? must you not be alerting? must he not be alerting? must we not be alerting? must you not be alerting? must they not be alerting?
Perfecto
must I not have alerted? must you not have alerted? must he not have alerted? must we not have alerted? must you not have alerted? must they not have alerted?
Perfecto con V-ing
must I not have been alerting? must you not have been alerting? must he not have been alerting? must we not have been alerting? must you not have been alerting? must they not have been alerting?