Future Perfect Tense

I will have sung
The future perfect tense is quite an easy tense to understand and use. The future perfect tense talks about the past in the future.

How do we make the Future Perfect Tense?

The structure of the future perfect tense is:
subject+auxiliary verb WILL+auxiliary verb HAVE+main verb
invariableinvariablepast participle
Look at these example sentences in the future perfect tense:
subjectauxiliary verbauxiliary verbmain verb
+Iwillhavefinishedby 10am.
+Youwillhaveforgottenme by then.
-Shewillnothavegoneto school.
In speaking with the future perfect tense, we often contract the subject and will. Sometimes, we contract the subject, will and have all together:
I will haveI'll haveI'll've
you will haveyou'll haveyou'll've
he will have
she will have
it will have
he'll have
she'll have
it'll have
we will havewe'll havewe'll've
they will havethey'll havethey'll've
We sometimes use shall instead of will, especially for I and we.

How do we use the Future Perfect Tense?

The future perfect tense expresses action in the future before another action in the future. This is the past in the future. For example:
  • The train will leave the station at 9am. You will arrive at the station at 9.15am. When you arrive, the train will have left.
The train will have left when you arrive.
Train leaves in future at 9am.

You arrive in future at 9.15am.
Look at some more examples:
  • You can call me at work at 8am. I will have arrived at the office by 8.
  • They will be tired when they arrive. They will not have slept for a long time.
  • "Mary won't be at home when you arrive."
    "Really? Where will she have gone?"
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