该词可作为名词和动词使用，两个词性都可加s，但意义不同。As n. Do you know the benefits of the project? As V. He benefits from the project.因此其为可数名词，复数加s，做动词时，第三人称单数加s.
动名词做主语谓语动词用单数形式。句子中good care和nice chats是并列的，Having a good care and nice chats是句子的主语，也就是说Having a good care and nice chats相当于一个动名词短语，因此谓语benefit要加s
