私が君だったら

if I were you

→ 私
phrase Rare #39,205
if I were you Used to give advice by imagining being in the other person's situation. 君 is an informal way to say “you,” often used toward someone of equal or lower status.
JA: 私が君だったら、そんな高い物は買わない。
EN: If I were you, I wouldn't buy something that expensive.

私が君だったらそんな無礼なことをしたりしないでしょう

If I were you, I wouldn’t do something so rude.

私が君だったらそんな事はしないだろうと彼は私に言った

He told me that if he were me, he wouldn't do such a thing.

もし私が君だったらすぐ帰宅するだろう

If I were you, I would go home right away.

私が君だったらもっと一生懸命勉強するでしょう

If I were you, I would study harder.