If you heat ice, - It melts, If she comes home, - I will tell her about the exam, If I were you, - I would follow his advice, If I had met Susan last week, - I would have given her book, Structure: If+present simple, - …Present simple, Structure: If+present simple - And will+infinitives, Structure: If+past simple - And would+infinitives, Structure: If+past perfect - And would+have+past participle, Uses: A hypothetical condition - And its probable result , Uses:and unreal pass condicion - And its probable result in the past,

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