Explanation
If Conditionals Conditional sentences describe a condition (if-part) and a result (main clause). 0) Zero Conditional (General Truths): If + Present Simple, Present Simple. Used for scientific facts, natural laws, habits. (If water reaches 100°C, it boils.) 1) First Conditional (Real Future Possibility): If + Present Simple, will + base verb. (If it rains, we will cancel the trip.) Trap: Do not put 'will' directly after 'if'. (Wrong: If he will come... ) 2) Second Conditional (Unreal Present/Future): If + Past Simple, would + base verb. Used for imaginary situations. (If I had more time, I would learn another language.) Note: Use 'were' for all subjects (If I were you). 3) Third Conditional (Unreal Past/Regret): If + Past Perfect, would have + past participle. Impossible past situation. (If I had studied harder, I would have passed.) 4) Mixed Conditionals: Past condition affecting present result (If + Past Perfect, would + base verb) OR Present condition affecting past result (If + Past Simple, would have + past participle). 5) Special Forms: Unless (If not), In case, As soon as, Provided that. Embedded If/Whether Questions An embedded question is a question hidden inside another sentence. It does not stand alone as a direct question. Direct: Is the experiment successful? Embedded: The researchers wanted to know if the experiment was successful. Key Rules for Embedded Questions: Use normal statement word order. (introductory phrase + question word / if / whether + subject +…