Overview of Real Conditionals
We have previously learned that real conditionals have two parts: the if clause and the main clause. These two clauses have a "cause-and-effect" relationship in real conditional sentences. The if clause introduces something that may or may not happen. The main clause tells of a possible result based on the if clause (what might or might not happen after the if clause).

If she gets a raise, she'll find a new apartment. ("If she gets a raise" is the if clause, which tells you something that may or may not happen. "She'll find a new apartment" tells you the result that will happen based on the if clause).
Expressing Certainty
"Factual conditionals" are used to express results that the speaker is certain of.

If you owe money on your credit card, the bank charges interest for it. (The bank will for sure charge your card with interest if you owe money on your credit card.)
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