Generally, We use conditional sentence in this way, (1) If you work hard, You will get success. (2) If you lend me some money, I will be obliged. (3) If I found a wallet here, I would return it to the police. We commanly don't use would, will, could in - If - part sentence And when we use - If you could / would / will - Sentences indicate - suggestion, request - This is understood. Do we use for any other purpose - except suggestion or request In real or unreal conditional.