How to say "for today" or "for me". Inform of: "Thats hard for me" ?
Please provide example sentences.

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"for A" is often translated as Aのために.
ex. He came back for me. 彼は私のために帰ってきました。

But "for" has many means, so there are other translations.
ex. That's hard for me. あれは私には難しい。