"Will have announced" is the future perfect tense of announce.
The future tense of announce is will announce.
The future perfect tense is will have given.
The future perfect tense is will have known.
The future perfect tense is will have started.
The future perfect tense is will have cried.
The future perfect tense is 'will have realized.'
The future perfect tense is will have lost.
Simple past tense - announced Simple present tense - announce/announces Simple future tense - will announce
present tense past tense future tense present perfect tense past perfect tense future perfect tense present progressive tense past progressive tense future progressive tense present perfect progressive tense past perfect progressive tense future perfect progressive tense
The future perfect tense of be is will have been.
The future perfect tense of be is will have been.
The future perfect tense of to drive is will have driven.