ANNOUNCE - PRESENT SIMPLE
★ i announce
★ you announce
★ he/she/it announces
★ we announce
★ you announce
★ they announce
ANNOUNCE - PRESENT CONTINUOUS
★ i am announcing
★ you are announcing
★ he/she/it is announcing
★ we are announcing
★you are announcing
★ they are announcing
ANNOUNCE - PRESENT PERFECT
★ i have announced
★ you have announced
★ he/she/it has announced
★ we have announced
★ you have announced
★ they have announced
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
ANNOUNCE - PRESENT PERFECT CONTINUOUS
★ i have been announcing
★ you have been announcing
★ he/she/it has been announcing
★ we have been announcing
★ you have been announcing
★ they have been announcing
ANNOUNCE - PAST SIMPLE
★ i announced
★ you announced
★ he/she/it announced
★ we announced
★ you announced
★ they announced
ANNOUNCE - PAST CONTINUOUS
★ i was announcing
★ you were announcing
★ he/she/it was announcing
★ we were announcing
★ you were announcing
★ they were announcing
ANNOUNCE - PAST PERFECT
★ i had announced
★ you had announced
★ he/she/it had announced
★ we had announced
★ you had announced
★ they had announced
The PAST SIMPLE tense, is also called the PRETERIT.
ANNOUNCE - PAST PERFECT CONTINUOUS
★ i had been announcing
★ you had been announcing
★ he/she/it had been announcing
★ we had been announcing
★ you had been announcing
★ they had been announcing
ANNOUNCE - FUTURE SIMPLE
★ i will announce
★ you will announce
★ he/she/it will announce
★ we will announce
★ you will announce
★ they will announce
ANNOUNCE - FUTURE CONTINUOUS
★ i wil be announcing
★ you will be announcing
★ he/she/it will be announcing
★ we will be announcing
★ you will be announcing
★ they will be announcing
ANNOUNCE - FUTURE PERFECT
★ i will have announced
★ you will have announced
★ he/she/it will have announced
★ we will have announced
★ you will have announced
★ they will have announced
ANNOUNCE - FUTURE PERFECT CONTINUOUS
★ i will have been announcing
★ you will have been announcing
★ he/she/it will have been announcing
★ we will have been announcing
★ you will have been announcing
★ they will have been announcing

Conjugation of verb Announce