Zero: describe events and results that happen regularly or are always true, "If" and "when" both mean "every time", use a present tense in both parts , If the lizard gets scared, it hides., when I get tired,I have a rest, First: describes possible future events and expected results of those events, [ If + object + present tense, future form ], If I don't work hard, I won't be successful., The animals won't come out, if we don't stay quiet.,

Zero and first conditional

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