The future is avoided when it appears in the main clause: If I see you, I will greet you. I'll buy you a sandwich if you give me the money. As for your example sentences, only #3 sounds wrong; it should read 'if I'm lucky enough'.
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AnonymousI've read from English grammar books that there is no future in 'if' clauseTrue, but this "rule" doesn't apply to indirect questions, as in #1 and #2.
AnonymousIs it an absolute rule to always use future tense in if clauses with regard to reciprocal bargaining suggestions?No. They often follow the usual pattern for first conditionals as you have shown.
Anonymouswhich is usually used?I don't know. I suspect it may be about 50-50.
CalifJimI don't know. I suspect it may be about 50-50.Just wanted to be one of the majority speakers that's why I thought of the question, but in this case it may be 50-50 as you've said. I guess it's not really of importance, though.