"tomorrow" is in the wrong place. Otherwise, it's OK. If I saw him tomorrow, I would smile at him.
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Aspara Gus If I see him tomorrow, I will smile at him.That's the only thing I would say.
austere125rivers... because I wanted to understand the conditionalOh. OK. Be careful. It's tricky because, as you see, the past tense is not used with its usual meaning in conditional constructions.