' I'm not aware of any difference when the instructions are used in this context. I guess you could say that "Answer the questions for yourself" is an idiom and "Answer the questions yourself" is not. "Answer the questions by yourself" has the same meaning as the others, and I don't think it's considered an idiom.
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martinleeIs there difference between 'Answer the questions yourself.' and 'Answer the questions for yourself.'I'm not aware of any difference when the instructions are used in this context.