If you leave now, , you'll catch the 8:00 train., The ticker will be cheaper, if you travel after 9:00., You'll learn more quickly, if you come to every class., If you get that new job, , will you earn more money?, You won't pass your driving test , if you don't have enough lessons., If I lend you this book, , will you give it back to me soon?, If I don't see you this afternoon, , I'll call you this evening..

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