Answer: A conditional sentence expresses the idea that the action in the main clause (the result clause) can only happen when a certain condition (the clause that begins with if) is fulfilled. The if clause states the condition, and the main clause states the result.
You can change the order of the clauses. You don't need a comma between the clauses when the if-clause is after the result-clause. Compare: comma: If this event or condition happens, this will likely happen.
The conditional clause can come before or after the main clause.
