他们自己 用英文怎么说

"他们自己" 用英语说 "themselves"。

"themselves" 是英语中的反身代词，表示 "他们自己"。它是由 "them" 和 "-self" 的后缀组合而成的。

例句:

They did it themselves. (他们自己做了这件事。)
They will have to rely on themselves. (他们将不得不依靠自己。)
They can fix it themselves if they want to. (如果他们愿意，他们可以自己修理。)