English verb conjugation
COULD ALERT

Regular verb: alert - alerted - alerted

Affirmation

Simple form	V-ing form
I could alert you could alert she could alert we could alert you could alert they could alert	I could be alerting you could be alerting she could be alerting we could be alerting you could be alerting they could be alerting
Perfect	V-ing perfect
I could have alerted you could have alerted she could have alerted we could have alerted you could have alerted they could have alerted	I could have been alerting you could have been alerting she could have been alerting we could have been alerting you could have been alerting they could have been alerting

Negation

Simple form	V-ing form
I could not alert you could not alert she could not alert we could not alert you could not alert they could not alert	I could not be alerting you could not be alerting she could not be alerting we could not be alerting you could not be alerting they could not be alerting
Perfect	V-ing perfect
I could not have alerted you could not have alerted she could not have alerted we could not have alerted you could not have alerted they could not have alerted	I could not have been alerting you could not have been alerting she could not have been alerting we could not have been alerting you could not have been alerting they could not have been alerting

Interrogative form

Simple form	V-ing form
could I alert? could you alert? could she alert? could we alert? could you alert? could they alert?	could I be alerting? could you be alerting? could she be alerting? could we be alerting? could you be alerting? could they be alerting?
Perfect	V-ing perfect
could I have alerted? could you have alerted? could she have alerted? could we have alerted? could you have alerted? could they have alerted?	could I have been alerting? could you have been alerting? could she have been alerting? could we have been alerting? could you have been alerting? could they have been alerting?

Interro-negative form

Simple form	V-ing form
could I not alert? could you not alert? could she not alert? could we not alert? could you not alert? could they not alert?	could I not be alerting? could you not be alerting? could she not be alerting? could we not be alerting? could you not be alerting? could they not be alerting?
Perfect	V-ing perfect
could I not have alerted? could you not have alerted? could she not have alerted? could we not have alerted? could you not have alerted? could they not have alerted?	could I not have been alerting? could you not have been alerting? could she not have been alerting? could we not have been alerting? could you not have been alerting? could they not have been alerting?