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Future Perfect

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Future Perfect Tense: Form and Use 
Simple explanation and charts that show how to form and use it from The English Club.
Longer explanation that also explains how to use it with adverbs, and the difference between the active and passive voice (englishpage.com)
You can listen to examples of positive and negative forms. Good examples of question form. (perfect-english-grammar.com)
Simple but good explanation with comprehensive examples. (eslcafe.com)
Shows the negative form. (eslcafe.com)
Another good description with examples. (headsupenglish.com)
A video of a teacher explaining future perfect tense at a whiteboard. It's like you're in a classroom! (youtube.com)
Nothing is perfect (except the future, sometimes!)

en we use the future perfect, we are imagining the future and talking about what has already happened. We always use a future perfect phrase with another part of the sentence that tells us "when."

Future perfect: I will have gone.
Sentence: When you wake up tomorrow, I will have gone.

In this sentence, you are telling someone that you plan to leave. You are telling them that you will leave before they wake up. Of course, you could also say, "I will leave before you wake up." That is another way to say the same thing.

When we use the future perfect, we predict that at a time in the future, other things have already happened.