If you gave us a discount, we would order more.
If we ordered more, would you give us a discount?
If you give us a 10% discount, we will order 500.
If we order 500, can you give us a 10% discount?
If I had known you were coming I would have baked a cake.
If I had worked hard, I would have passed the exam.
If Mike had known more about their culture, negotiating would have been easier.
If they had left earlier, they would have arrived on time.
If + 主詞 + 過去簡單式, 主詞 + would/could + have + 動詞