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