Can you tell the difference between Japanese, Chinese, and Korean people?
こんにちは。
さまざまな言い方ができると思いますが、下記のような英語表現はいかがでしょうか：
Can you tell the difference between Japanese, Chinese, and Korean people?
日本人、中国人、韓国人の区別はつきますか？
tell the difference で「区別がつく」「違いがわかる」の意味になります。
ぜひ参考にしてください。
Can you distinguish between Japanese, Chinese and Korean?
"日本人と中国人と韓国人の区別はつきますか？"
- Can you distinguish between Japanese, Chinese and Korean people?
- Can you tell between Japanese, Chinese, and Korean people?
- Can you tell the difference between Japanese, Chinese, and Korean people?
- Are you able to tell Japanese, Chinese, and Korean people apart?
アメリカ合衆国 
