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.