Conditional Sentences in English Grammar - Zero First Second Third Mixed Conditionals

What are Conditional Sentences?

Conditional sentences show condition and result, if this happens then that happens. Two parts: If clause (condition) and Main clause (result). For SSC CGL, CHSL, CPO, Railway, Banking, CTET conditionals are very important because if clause rules, tense matching, unless, whether confusion cause many errors. Example: If you work hard, you will pass. If it rains, we will not go. Conditionals are of four main types plus mixed: Zero Conditional for universal truth, First Conditional for real future possibility, Second Conditional for unreal present imaginary, Third Conditional for unreal past regret. Structure always: If + condition, main result. If clause can come first or second - If you work hard, you will pass = You will pass if you work hard same meaning but comma only when if clause first.

Types of Conditional Sentences

Zero Conditional, First Conditional, Second Conditional, Third Conditional

Zero Conditional: Universal truth, scientific fact, habit - If + present simple, present simple. Structure: If + present, present. Example: If you heat water, it boils. If it rains, roads get wet. Both clauses present simple because truth always true. First Conditional: Real future possibility, likely to happen - If + present simple, will + V1. Structure: If + present, will + V1. Example: If you work hard, you will pass. If it rains, we will not go. If you come, I will help. Second Conditional: Unreal present, imaginary, unlikely now, advice - If + past simple, would + V1. Structure: If + past, would + V1. Example: If I were rich, I would help you (but I am not rich now imaginary). If you worked hard, you would pass (but you don't work hard now). If I were you, I would not do it (advice). Note: Were for all persons in if clause - If I were, If he were, If they were (were is more correct than was for imaginary, though was also used informally). Third Conditional: Unreal past, regret, past imaginary did not happen - If + past perfect, would have + V3. Structure: If + had + V3, would have + V3. Example: If you had worked hard, you would have passed (but you did not work hard in past, so you did not pass past regret). If he had come, I would have helped (but he did not come past).

Mixed Conditionals, Unless, Whether and If, Modals in Conditionals

Mixed Conditionals: Condition past, result present or condition present, result past mixed time. Past condition present result: If you had worked hard, you would be rich now (past condition had worked, present result would be rich now). Present condition past result? Usually second type but mixed. Unless means if not, negative condition - Unless you work hard, you will not pass = If you do not work hard, you will not pass. Never use not with unless, Unless + not double negative wrong - Unless you do not work hard wrong, should be Unless you work hard or If you do not work hard. Whether means if or not, choice - I don't know whether he will come or not (whether = if choice). If shows condition, Whether shows choice - Whether he will come is uncertain choice. Common: Whether or not, not If or not? Both okay but whether more formal for choice. Modal in conditionals: If you can come, please come (can in if clause allowed for ability). If you should see him, tell him (should in if clause for less possibility). If you will help me, I will be thankful (will in if clause allowed for polite willingness). Common errors: If you will work hard wrong, If you would work hard wrong, If I would have worked wrong should be If I had worked.

Common Errors in Conditional Sentences for SSC

Most SSC errors: 1) Will/Would in If clause - If you will work hard, you will pass wrong, should be If you work hard, you will pass present in if clause. 2) Second conditional past - If you will work hard, you would pass wrong, should be If you worked hard, you would pass past in if clause. 3) Third conditional had - If you would have worked hard, you would have passed wrong, should be If you had worked hard, you would have passed had + V3 in if clause. 4) Unless + not - Unless you do not work hard, you will fail wrong double negative, should be Unless you work hard or If you do not work hard. 5) Were vs Was in imaginary - If I was rich wrong for formal imaginary, should be If I were rich were for all persons in second conditional imaginary (was also accepted informally but were is preferred in exams). 6) If I were you, I would not go - correct for advice imaginary, If I were you I will not go wrong will should be would for second conditional.