Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could alert caution you could alert caution he could alert caution we could alert caution you could alert caution they could alert caution
V-ing form
I could be alert cautioning you could be alert cautioning he could be alert cautioning we could be alert cautioning you could be alert cautioning they could be alert cautioning
Perfect
I could have alert cautioned you could have alert cautioned he could have alert cautioned we could have alert cautioned you could have alert cautioned they could have alert cautioned
V-ing perfect
I could have been alert cautioning you could have been alert cautioning he could have been alert cautioning we could have been alert cautioning you could have been alert cautioning they could have been alert cautioning
Negation
Simple form
I could not alert caution you could not alert caution he could not alert caution we could not alert caution you could not alert caution they could not alert caution
V-ing form
I could not be alert cautioning you could not be alert cautioning he could not be alert cautioning we could not be alert cautioning you could not be alert cautioning they could not be alert cautioning
Perfect
I could not have alert cautioned you could not have alert cautioned he could not have alert cautioned we could not have alert cautioned you could not have alert cautioned they could not have alert cautioned
V-ing perfect
I could not have been alert cautioning you could not have been alert cautioning he could not have been alert cautioning we could not have been alert cautioning you could not have been alert cautioning they could not have been alert cautioning
Interrogative form
Simple form
could I alert caution? could you alert caution? could he alert caution? could we alert caution? could you alert caution? could they alert caution?
V-ing form
could I be alert cautioning? could you be alert cautioning? could he be alert cautioning? could we be alert cautioning? could you be alert cautioning? could they be alert cautioning?
Perfect
could I have alert cautioned? could you have alert cautioned? could he have alert cautioned? could we have alert cautioned? could you have alert cautioned? could they have alert cautioned?
V-ing perfect
could I have been alert cautioning? could you have been alert cautioning? could he have been alert cautioning? could we have been alert cautioning? could you have been alert cautioning? could they have been alert cautioning?
Interro-negative form
Simple form
could I not alert caution? could you not alert caution? could he not alert caution? could we not alert caution? could you not alert caution? could they not alert caution?
V-ing form
could I not be alert cautioning? could you not be alert cautioning? could he not be alert cautioning? could we not be alert cautioning? could you not be alert cautioning? could they not be alert cautioning?
Perfect
could I not have alert cautioned? could you not have alert cautioned? could he not have alert cautioned? could we not have alert cautioned? could you not have alert cautioned? could they not have alert cautioned?
V-ing perfect
could I not have been alert cautioning? could you not have been alert cautioning? could he not have been alert cautioning? could we not have been alert cautioning? could you not have been alert cautioning? could they not have been alert cautioning?