1·Humans can not make progress without dreams.
没有梦想，人类就不能进步。
2·These students can not concentrate on their study.
这些学生不能集中精力学习。
3·Plants and animals can not live now on Mars.
植物和动物现在不能在火星上生活。
4·They can not live for long periods in cold weather.
它们不能在寒冷的天气中长时间生存。
5·"I can not play anymore," I said on the third day.
“我不能再玩了。”我在第三天的时候说。
6·Children who have malnutrition do not grow properly and they can not concentrate at school.
营养不良的儿童不能正常生长，无法在学校集中注意力。
7·Salt takes in plenty of water, so most bacteria can not live in a salty environment.
盐会吸收大量的水，所以大多数细菌不能在含盐的环境中生存。
8·Cindy can not cross the street.
辛迪不能过马路。
9·Some food can not be stored.
有些食物不能贮存。
10·I can not give the actual figures.
我不能举出实际数字。