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?
have to vs will have to
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Newton
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Alan
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Re: have to vs will have to
Either will, or may be, away (I'm assuming that you understand the implications of 'if'...)