数学是一项工具，特别适合于处理任何一类抽象概念，而且，它在这方面的作用是无止境的。

Mathematics is the tool specially suited for dealing with abstract concepts of any kind and there is no limit to its power in this field.

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数的形式如果这种主语指的是一类人动词用复数如果指的是单个人或抽象概念，动词用单数。的是单个人或抽象概念动词用单数。

With such a subject, the choice between a plural or a singular verb depends on whether the adjective refers to a group of people or to a particular person or an abstract quality.

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