Eating Dangshen and Huangqi herbs is also good for this.为什么系

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Eating Dangshen and Huangqi herbs is also good for this.为什么系动词是单数形式而不是复数?
简洁一点

因为主语是Eating Dangshen and Huangqi herbs,看做一个动作,所以用三单.
再问：此句是动名词短语做主语，and只是连接这个短语中的两个名词而已，Eating sth is… sth在此句中就指dang…herbs，这种动名词短语做主语的句子只是看有几个动名词短语来决定是用is或are，跟后面有几个名词没关系。
再答：这是个主语从句，Eating Dangshen and Huangqi herbs整体作为主语，and是用来连接eat所辖的两个宾语的，这两个宾语分别是Dangshen 和 Huangqi herbs。

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