ALERT - PRESENT SIMPLE
★ i alert
★ you alert
★ he/she/it alerts
★ we alert
★ you alert
★ they alert
ALERT - PRESENT CONTINUOUS
★ i am alerting
★ you are alerting
★ he/she/it is alerting
★ we are alerting
★you are alerting
★ they are alerting
ALERT - PRESENT PERFECT
★ i have alerted
★ you have alerted
★ he/she/it has alerted
★ we have alerted
★ you have alerted
★ they have alerted
A transitive verb always has a noun that  receives the action of the verb, called the direct object.
An intransitive verb never has a direct or indirect object. Although an intransitive verb may be followed by an adverb or adverbial phrase, there is no object to receive its action
ALERT - PRESENT PERFECT CONTINUOUS
★ i have been alerting
★ you have been alerting
★ he/she/it has been alerting
★ we have been alerting
★ you have been alerting
★ they have been alerting
ALERT - PAST SIMPLE
★ i alerted
★ you alerted
★ he/she/it alerted
★ we alerted
★ you alerted
★ they alerted
ALERT - PAST CONTINUOUS
★ i was alerting
★ you were alerting
★ he/she/it was alerting
★ we were alerting
★ you were alerting
★ they were alerting
ALERT - PAST PERFECT
★ i had alerted
★ you had alerted
★ he/she/it had alerted
★ we had alerted
★ you had alerted
★ they had alerted
The PAST SIMPLE tense, is also called the PRETERIT.
ALERT - PAST PERFECT CONTINUOUS
★ i had been alerting
★ you had been alerting
★ he/she/it had been alerting
★ we had been alerting
★ you had been alerting
★ they had been alerting
ALERT - FUTURE SIMPLE
★ i will alert
★ you will alert
★ he/she/it will alert
★ we will alert
★ you will alert
★ they will alert
ALERT - FUTURE CONTINUOUS
★ i wil be alerting
★ you will be alerting
★ he/she/it will be alerting
★ we will be alerting
★ you will be alerting
★ they will be alerting
ALERT - FUTURE PERFECT
★ i will have alerted
★ you will have alerted
★ he/she/it will have alerted
★ we will have alerted
★ you will have alerted
★ they will have alerted
ALERT - FUTURE PERFECT CONTINUOUS
★ i will have been alerting
★ you will have been alerting
★ he/she/it will have been alerting
★ we will have been alerting
★ you will have been alerting
★ they will have been alerting

Conjugation of verb Alert