English grammar.
When we are talking about two consecutive events of the future.
First event we describe with the 'will'- We will do something. And after the ending of our first part of sentence we are proseeding with ' and then ' bla,bla,bla, coming along further with the second part of our story.
Is it necessary to put the second event in the form of ' will have done' or it is a matter of choice?

Thanks.

Question

English grammar.
When we are talking about two consecutive events of the future. 
First event we describe with the 'will'-> We will do something. And after the ending of our first part of sentence we are proseeding with ' and then ' bla,bla,bla, coming along further with the second part of our story.
Is it necessary to put the second event in the form of ' will have done' or it is a matter of choice?

Thanks.

Answer

I am not clear about your question. For future events in series, there would be no place for "will have done". For example, you might say "next year I will graduate, and then I will buy a new car". Also possible is "next year I will graduate and then (will) buy a new car". Adding the second "will" in the example sounds strange to me, but I think it is correct grammatically.

Answer

OK. I understand. To answer your question, I think it is necessary to use future perfect tense in that case, saying "will have discovered fire." It describes an event happening in some unknown future time. For correct usage, I don't think it's optional.

Answer

Here's an example:
"Someday when men have conquered the winds,the waves,the tides and gravity,we WILL HARNESS for God the energies of love, and THEN, for a second time in the history of the world, man WILL HAVE DISCOVERED fire." Written by some philosopher.

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