英语句子中的逗号有多种作用。
首先，逗号可以用来分隔一个句子中的不同部分，以使句子更加清晰和易读。
例如，逗号可以用来分隔修饰语、状语从句以及并列的词组或短语。
此外，逗号还可以用于列举。
当我们需要列举相同类别的事物时，逗号可以在这些事物之间进行分隔，以便更好地展示它们的关系。
除此之外，逗号也可以用来表示插入语，即一个句子中的附加信息。
在这种情况下，逗号将插入语与句子的其余部分分隔开来，使读者可以更清楚地理解句子的意思。
总之，逗号在英语句子中起到了分隔和标识不同语言成分的重要作用。
Commas play multiple roles in English sentences. Firstly, commas are used to separate different parts of a sentence, making it clearer and easier to read. For example, commas can be used to separate modifiers, adverb clauses, as well as parallel phrases or clauses. Moreover, commas are also used for enumeration. When we need to list items of the same category, commas are used to separate these items, better illustrating their relationship. In addition, commas can be used to indicate parenthetical information, i.e., additional information within a sentence. In such cases, commas are used to set off the parenthetical from the rest of the sentence, allowing readers to better understand the meaning. In conclusion, commas play an important role in English sentences by serving as separators and markers for different linguistic components.