ALLOW - PRESENT SIMPLE
★ i allow
★ you allow
★ he/she/it allows
★ we allow
★ you allow
★ they allow
ALLOW - PRESENT CONTINUOUS
★ i am allowing
★ you are allowing
★ he/she/it is allowing
★ we are allowing
★you are allowing
★ they are allowing
ALLOW - PRESENT PERFECT
★ i have allowed
★ you have allowed
★ he/she/it has allowed
★ we have allowed
★ you have allowed
★ they have allowed
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
ALLOW - PRESENT PERFECT CONTINUOUS
★ i have been allowing
★ you have been allowing
★ he/she/it has been allowing
★ we have been allowing
★ you have been allowing
★ they have been allowing
ALLOW - PAST SIMPLE
★ i allowed
★ you allowed
★ he/she/it allowed
★ we allowed
★ you allowed
★ they allowed
ALLOW - PAST CONTINUOUS
★ i was allowing
★ you were allowing
★ he/she/it was allowing
★ we were allowing
★ you were allowing
★ they were allowing
ALLOW - PAST PERFECT
★ i had allowed
★ you had allowed
★ he/she/it had allowed
★ we had allowed
★ you had allowed
★ they had allowed
The PAST SIMPLE tense, is also called the PRETERIT.
ALLOW - PAST PERFECT CONTINUOUS
★ i had been allowing
★ you had been allowing
★ he/she/it had been allowing
★ we had been allowing
★ you had been allowing
★ they had been allowing
ALLOW - FUTURE SIMPLE
★ i will allow
★ you will allow
★ he/she/it will allow
★ we will allow
★ you will allow
★ they will allow
ALLOW - FUTURE CONTINUOUS
★ i wil be allowing
★ you will be allowing
★ he/she/it will be allowing
★ we will be allowing
★ you will be allowing
★ they will be allowing
ALLOW - FUTURE PERFECT
★ i will have allowed
★ you will have allowed
★ he/she/it will have allowed
★ we will have allowed
★ you will have allowed
★ they will have allowed
ALLOW - FUTURE PERFECT CONTINUOUS
★ i will have been allowing
★ you will have been allowing
★ he/she/it will have been allowing
★ we will have been allowing
★ you will have been allowing
★ they will have been allowing

Conjugation of verb Allow