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English Grammar Reference: The Future Perfect Simple

To understand the future perfect simple just think about the present perfect simple:

I've been to Spain.

|____________||||||||||||||||||||||||||______________________|
Past
1970
Present
Future

I was born in 1970 and at some point since my birth and now I went to Spain. It doesn't matter when.

The future perfect has a similar idea but refers to some point in the future.
The keyword is "by".

By 2015 I will have learnt to speak Japanese.

|______________________||||||||||||||||||||||||||_____________________|
Past
Present
2015
Future

Between now and 2015 I will have learnt Japanese. It may be tomorrow, it may be on New Year's Eve 2014, but by 2015 I will have done it.

I will have had dinner by 9 pm.

|_________________||||||||||||||||||||||||||_____________________|
Past
Present
9 pm
Future

Between now and 9 pm I will have had dinner.

Look at the construction:

subject

will

have

past participle

 

I

will

have

made

a million dollars by the end of next year.

She

will

have

retired

by 2030.

They

will

have

got married

by next Christmas.

 

We use by plus a time or date (like since in the present perfect). If we want to add a phrase we can
say "by the time":

I'll have finished work by the time you get up.

They'll have eaten everything by the time you get here.

She'll have learnt the language by the time she goes away.