https://youtu.be/PgHelJXrBzM?si=GD8wGV69g5ig_IDw I used to watch her when i was learning chinese, you can learn how to differentiate the tones in this videos you can also go to her playlist here https://youtube.com/playlist?list=PLioS_-8erSI1B8dEErLr28sdgsHMui1d-&si=tWM9DKGG4WxTRvKH hope this helps!
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