I would say it's a nested conditional: "If X then (if Y then Z)". " pattern.
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"if" is a sub-ordinate conjunction (adverb clause) as conditional
"If and Whether" both are "noun clause markers", and they often used to report a Y/N question.
They are noun clauses functioning as a noun (Subject- object - complement). We only use "whether noun clause" as subject, but not "if noun clause".
Jane Namit is best if you set aside some time in the morning
I see the clause above as a zero-conditional one: If you set aside some time in the morning, it is best (for you).
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CGEL qualifies the usage of if ambiguously, first as a marker of subordination, hence it is named a subordinator (the one that introduces a sub
Jane NamIf you are wanting to accomplish a specific goal, it is best if you set aside some time in the morning, before you daily routine begins, and get thins done on it while you still have your full store of willpower for the day.
Let's abbreviate this.
[If you want to accomplish a goal], [it is best [if you work on it in the morning]].