The future perfect tense is used in a way that should remind you of how the past perfect tense is used. The main distinction, of course, is that the past perfect tense is used with events that happened in the past time. The future perfect tense, on the other hand, is used for events that will occur in the future. The following examples illustrate the differences and similarities.

Monday, 8:40 AM: Ayane sang in the classroom.
Monday, 8:45 AM: Ryusei sang in the classroom.

We can use the past perfect tense to show which event happened first in the past time as follows: Ayane had sung in the classroom before Ryusei did.

Tuesday, 9:00 PM: Eleazar will sing in the shower.
Tuesday, 9:30 PM: Maria Jose will sing in the shower.

We can use the future perfect tense to show which event will happen first in the future as follows: Eleazar will have sung in the shower before Maria Jose does.

It should be noted that when the events are dissimilar, the verb "does" is not used. Look closely at the following examples.
▓ Eleazar will have sung in the shower for ten minutes before his
 girlfriend finally covers her ears.
▓ Brad will have winked five times at Sakura before she slaps his face.

Let's take a careful look at how the future perfect tense is formed.

As with the other perfectives, the Future Perfect uses a form of the auxiliary HAVE and a past participle.

Present Perfect
The fat boy has shaken the tree. ("has" ==> PRESENT)
Past Perfect
Mr. Gordo had been there before. ("had" ==> PAST)
Future Perfect
Chubby Checker will have eaten everything by then. ("will have" ==> FUTURE)

Grammar Check-Up

Lydia writes to Santa.

Santa's elves get Lydia's letter.

Santa reads Lydia's letter.

Santa learns of Lydia's wish.

The elves work hard on Lydia's gift.

Lydia's gift is packaged.

Santa flies to Lydia's home.

Lydia waits on Christmas Eve.

Joe is pulled out of the chimney.

Joe greets Lydia.

Joe and Lydia fall in love.

Lydia writes a thank you letter.

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