How to Replace if in a Sentence

Most of the time, you're gonna hear if clauses with if. But there's a bunch of other words that you can use as conjunctions or on their own at the start of a sentence to replace the word if. And this is where some of the more tricky English grammar comes into play. So instead of having a synonym for if, you use something like had or should. Most native speakers will probably avoid using this unless they're writing very high level English.