“Help oneself to something” 是一个常见的英语短语，意思是“随便取用某物”或“自取（食物、饮料等）”，通常用于礼貌地邀请他人自行取用东西，尤其是在用餐或招待场合。
注意：主语是第三人称单数时，动词用 helps；其他情况用 help。
✅ “Help oneself to...” 后面必须接名词或名词短语，不能直接接动词。
❌ 错误：He helped himself to eat the cake.
✅ 正确：He helped himself to the cake.
✅ 复数主语时，用 “yourselves / themselves” 等反身代词：
“Kids, help yourselves to the fruit.”