\r＝祈使旬 （肯定 ）＋and＋陈述旬 （用肯定意义的动词 ）\rWork hard, or you'll fail the exam努力学习，不然你就会考不及格。 (fail\r有否定 意义）\rIf you don't work hard, you'll fail the exam. Work hard, and you'll pass\rthe exam.(pass有肯定 意义）\rGet up early, or you'll miss the train早点起床 ，不 然你会误车的。 (miss\r有否定意 义）\rIf you don't get up early,you'll miss the train. If you don't get up early,\ryou won't catch the train. Get up early and you'll catch the train.(catch有\r止 r 二 、\r目走思义）.\r提示\r祈使旬 ＋or＋陈述旬结构中的祈使旬有时也可用否定式 ， 这时，要转换\r为 if从旬的肯定式。不要吃得太多 ， 不然你会生病的。\rDon't eat too much,or you'll get ill.\rIf you eat too much, you'll get ill.\r不要睡在户 外，不 然你会感冒的。\rDon't sleep in the open, or you'll catch a cold. If you sleep in the open,\ryou'll catch a cold.
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