Re: if will
When 'will' expresses the idea of certainty about the future, it is highly unlikely in an if- clause suggesting possibility. You cannot combine certainty and possibility (=lack of certainty).
XI will be surprised if it will rain tomorrow.
When 'will' expresses some idea of willingness, there is no restriction.
If you will come with me, I will take you to Mr Postule's office.
When 'if' has a similar meaning to 'whether', there is no restriction.
Do you know if he will be there tomorrow?
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