The structure of 1st Conditional is, If + present simple, will + base verb, If + future simple, will + base verb, If + present simple, will + V2, 1st Conditional is used to talk about, an unreal future event or situation and its consequence, a real and possible future event or situation and its likely consequence, general truths, facts, or things that are always true, such as scientific laws, "Will" can be replaced by, modal verbs like "can," "may," or "should" in the if-clause, modal verbs like "could," "might," or "should" in the main clause, modal verbs like "can," "may," or "should" in the main clause, "Will" can also be replaced by, imperative mood, infinitive, gerund, 1st conditional sentence with "unless" has a structure of, Unless + don't/doesn't + present simple, present simple, Unless + present simple, will + base verb, Unless + don't/doesn't + present simple, will + base verb.

First Conditional rules

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