If you heat water to 100 degrees Celsius, it boils., Water doesn't boil if you don't heat it to 100 degrees Celsius., Does water boil if you heat it to 100 degrees Celsius?, If you mix red and blue, you get purple., You don't get purple if you don't mix red and blue., Do you get purple if you mix red and blue?, If it rains tomorrow, I will stay at home., I won't stay at home if it doesn't rain tomorrow., Will I stay at home if it rains tomorrow?, If she passes the exam, she will be very happy., She won't be very happy if she doesn't pass the exam., Will she be very happy if she passes the exam?, If I won the lottery, I would travel the world., If he had more time, he would learn to play the guitar., He wouldn't learn to play the guitar if he didn't have more time., Would he learn to play the guitar if he had more time?, If I had studied harder, I would have passed the exam., If they had arrived on time, they would have caught the train., If she had known about the party, she would have come., If he had invested in that company, he would have made a lot of money.,

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