Shall we eat out or stay in? It's up to you.

咱们是到外面吃饭还是待在家里？你决定吧。

《牛津词典》

Either is OK. It's up to you.

都可以。取决于你。

youdao

It's up to you.

由你作主。

《新英汉大辞典》

It's not possible. If you really want to make it up,fine, but it was not possible then, it is not possible now."

VOA: standard.2009.07.31

So if you really want class to make a difference in your life, it's up to you.

所以如果你真的想通过这门课改变生活，一切取决于你。

哈佛公开课 - 幸福课课程节选

All right, so it's very common to talk about electronegativity of different atoms, and you can look up tables of these.

好，这是很常见的,对于不同原子电负性的讨论，大家可以查阅这方面的表格。

麻省理工公开课 - 化学原理课程节选

Click on that and you get a page that reads: It's up to you.

NPR: New Radiohead CD to Debut Online

Mr. NAYDER: It's up to you.

NPR: Annoying Mother's Day Music

Mrs Merkel, it's up to you.

ECONOMIST: The global economy