那真好用英文怎么说

"That's really convenient" 或 "That's really handy" 是表示"那真好用"的常用英语表达。

其中 "convenient" 是源自拉丁语的 "convenire"，意为 "相符合，相适应"。"handy" 则是源自中古英语的 "handig"，意为 "方便的，实用的"。

例句：

"That's really convenient" 例句：It's convenient that the store is open late. (商店开放到很晚是很方便的。)
"That's really handy" 例句：This tool is really handy for fixing bikes. (这个工具很适合修自行车。)