Don't waste your money on useless thi ngs: whe n you need it you won't have any, because you will have spent it already . Anonymous Or any other way of saying something like this, where you're just speculating about the future? That seems fine.
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AnonymousOr any other way of saying something like this, where you're just speculating about the future?That seems fine. Since you are offering a strong injunction, 'will have' is the appropriate choice.