Felixxx I am not sure about whether if the second expression sounds more uncertain. Concerning "about whether if": Use only "whether" or "if", not both. Do not use "about".
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FelixxxI am not sure about whether if the second expression sounds more uncertain.Concerning "about whether if": Use only "whether" or "if", not both. Do not use "about". Thus,
FelixxxHe seems optimistic about the result. He seems to be