[Essay] Formal 'if yes/if so'

[petisaboss]

Is 'if yes/if so/if no' formal enough for a formal writing?

 

[curates-egg]

Is 'if yes/if so/if no' formal enough for a formal writing?

"If so" and "if not" are used both formally and quite informally.

 

[Leandro-Z]

I have never heard of "IF YES". "If so" and "If not" are used both for formal and informal writing. However, it's more formal to say "otherwise" instead of "if not".

Leandro