他们用英语的复数怎么说

"They" is a pronoun that is used to refer to a group of people. The plural form of "they" is "they". For example:

"They are going to the store."

"They are a group of friends."

The plural of a noun is usually formed by adding -s or -es to the end of the singular form of the noun. For example:

Singular: cat
Plural: cats

Singular: box
Plural: boxes

Singular: glass
Plural: glasses

If you have any other questions, please feel free to ask.