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  1. You have to supervise the task while I'm away.

  2. You'll have to supervise the task while I'm away.

  3. You have to supervise the task if I'm away.

  4. You'll have to supervise the task if I'm away.

Do they all refer to a particular time in the future when the speaker will be away?

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  • Yes they are referring to future tenses. Either sentences can be used depending on the previous context. – Dhanishtha Ghosh Nov 11 '20 at 13:41

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