I will tell you when he comes and I don't know when he will come

when he comes answers to the question I will tell you what? and when he will come answers to the same question I don't know what? when he will come. I will tell you and I don't know grammatically are the same (Am I right?)

So none of these questions answer to the question When, so why one is present and the other future

  • in THIS case, not that case. The case you are talking about. Answers the question, not answers to the question. – Lambie Jun 3 '17 at 16:17
  • I don't know what you're trying to ask, but this question is fairly similar to your previous question. – userr2684291 Jun 3 '17 at 16:48

I will tell you when he comes.
I don't know when he will come.

are both placed in the future, one speaks to when you will do an action, the other when he will do an action.

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