Learn English – Must conditional sentences begin with “if?”

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I've been looking at conditional sentences (conditional clauses).

Every example I've see is along the lines of, "if [x] then [y]."

I've seen alternatives/substitutes for the if part:

  • were I you (instead of "if I were you")
  • on condition that
  • unless
  • were

Yet, these still follow the same pattern: "condition [x] then [y]."

Is that the only way to have a conditional?
Is it not possible to invert/switch around the structure?
Would it still be a conditional clause (or conditional sentence) if I put the condition after the occurance?

  • If he eats that, he'll be sick.
  • He'll be sick if he eats that.
  • Unless you win this round, you are out.
  • You are out unless you win this round.

If those are not conditionals, what are they?
Would they be considered as "acceptable" if I were to be editing/rewriting something, or would it be seen as bad/improper/incorrect/having a sufficiently different implication?

Best Answer

Just as Fumblefingers comments, as long as there is a conditional clause (ie a subject-verb combination beginning with if, unless, etc) in a sentence, whether it follows the main clause or precedes it, it is always a conditional sentence.

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