Help with Future Perfect Continuous

Hello,
I don't really understand this particular tense.
I don't know when to use it. Could anyone give me more explanations and examples.
Thank you in advance.



Hi, anonymous-

Here's an example: By the time you read this, you will have been waiting for a response for over three hours. Or how about this: By the time a person dies, he will have eaten, on average, eight spiders in his sleep. (Creepy, but true!) Another: At the rate I'm losing weight on this diet, I will have lost ten pounds by March.

It is used to look back from the future at a completed action. It's our little time machine to look back on the completed past from a point in the future.

Hope it helps!

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Heck, these examples are good. I'm impressed.

hey, i am new at learning english. this site has been very useful in improving my grasp over tenses but i m facing problem in usage of this very tense.can you elaborate it , just few more illustrations.thanks in advance.