I have made this worksheet out of different sources to explain conditionals type 0, 1 and 2 to my students (upper intermediate level). I used it in class to explain the grammar and then gave the exercises (found on another great worksheet from this website) as homework.
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Conditionals Type 0, 1, 2 Powerpoint Presentation
Are Your Students Suffering From Conditional Confusion?
4 Simple Steps To Explain The 4 Types Of English Conditionals