如果你想用英语表达"某人"的意思，可以使用单词"someone"。这个单词源自英语中的"some"和"one"，其中"some"表示"一些"，"one"表示"一个"。
下面是一些例句，可以帮助你更好地理解这个单词的用法：
Can someone help me with this?
Someone left their umbrella on the train.
I think someone is following us.
Someone has to take responsibility for this mistake.
Is there someone who can translate this for me?
希望这些例句能帮助你。如果你还有其他问题，欢迎继续提问。