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What is the difference between

a) By then, you will have shown what you meant to do since the beginning.

b) By then, you will show what you meant to do since the beginning.(Is this grammatically correct at all?)

Thank you.

  • I can't seem to find you on chat. This is the only way I know of signaling you. – deadrat Jun 4 '16 at 7:54
  • dr sir I messaged you on forums. Please come there. Thanks. Policewala/gargie – Policewala Jul 26 '16 at 0:34
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By then can be taken to mean "when the time under discussion has arrived", so we expect that what will follow is something that will be true at that point.

you will show is indicating that you are going to show something at an unspecified point in the future.

The two things don't mesh: you can't talk about an unspecified future event happening in relation to a specific point in time that's under discussion.

By then, you will have shown what you meant to do since the beginning.

this sentence doesn't have the same problem:

The future perfect you will have shown is saying that we are looking back from some point in the future where you will already have shown whatever is being talked about. "By then" then indicates what that point in the future is, so the sentence makes perfect sense.

  • Thank you John. When you say "The two things don't mesh: you can't talk about an unspecified future event happening in relation to a specific point in time that's under discussion.", then I have a doubt which is following 'By monday I will give you the book', even here we talk about an unspecified future event happening in relation to a specific point in time that's under discussion. Then why is this correct? How different are the following two a) By then, you will show what you meant to do since the beginning. b) By monday I will give you the book.(why is it correct?) Thank you – Policewala Apr 5 '16 at 16:07
  • I was in the middle of typing up a response to this when I started second-guessing what I answered in the first place. I'm gonna have to look into this further to make sure what I said was even correct. – John Clifford Apr 5 '16 at 18:41

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