I think you must be mixing me up with someone else.

我觉得你一定是把我错当成别人了。

《牛津词典》

I have deadlines which would make life with someone else fairly difficult.

我有最后期限，这会让我和别人生活变得相当困难。

youdao

They find that doing a project with someone else makes the job more pleasant and the load lighter.

他们发现，和别人一起做项目会让工作更愉快，负担更轻。

youdao

A young man may suffer from the green-eyed monster if his girlfriend begins going out with someone else.

VOA: special.2010.05.23

It's the fact you're getting this extra benefit from working with someone else that makes it worth while working as a team to start with.

但是现实是在你和他人合作中,你会获得额外的收益,这样合作才有价值

耶鲁公开课 - 博弈论课程节选

he throws the ball and then the receiver or someone else can catch it and then they run with it.

他扔球，然后接球的或者其他人可以抓住球，带着球跑。

美式足球 - SpeakingMax英语口语达人

That problem would go away if I had my systems hosted with someone else.

FORBES: Why I'm Moving To The Cloud

Of note, a higher percentage of respondents reported to be single parents but acknowledged co-parenting with someone else.

FORBES: The Happiest Working Mothers Don't Always "Have It All"

In fact, sharing the world as you see it with someone else may be the ultimate social experience.

FORBES: Google's Competitor For Facebook Isn't Plus. It's Project Glass.