Câu 1: Paul doesn't think about the planet. He will waste so much water. ( If ) Câu 2: Unless we take action immediately, the air will become completely polluted. ( If )

Paul doesn't think about the planet. He will waste so much water. ( If )

⇒ If Paul thought about the planet, he wouldn't waste so much water

⇒Câu điều kiện loại 2

Unless we take action immediately, the air will become completely polluted. ⇒( If )

⇒ If we don't take action immediately,the air will become completely polluted

⇒Loại 1