First Conditional: To talk about realistic situations in the future, If+present Simple / will+V, If it rains tomorrow, I'll stay at home, Second Conditional: to talk about present situations or states which are impossible or very unlikely, If+Past Simple / would/wouldn't +inf, If you had an accident, who would you call fi rst?, Third Conditional: to talk about possible events express regret or criticismin the past that did not happen. We often use them to, If+Past Perfect / would/wouldn't have+past participle, If I had worn a helmet, I wouldn’t have got hurt so badlyduring the fall ,

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