•I don't think ghosts exist.我认为鬼是不存在的。

•Poverty still exists in this country.这个国家仍存在贫困现象。

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•Some species exist in this small area of forest and nowhere else on Earth.一些物种仅存于这一小片森林中，地球上其他地方都没有。

•Few people can exist without water for more than a week.很少有人能在断水的情况下生存超过一星期。

•No-one can be expected to exist on such a low salary.无法想像有甚么人能靠这么低的工资维持生计。