基于【jīyú】

基于 names what a decision, conclusion or method rests on: "based on", "on the basis of". It takes a noun phrase – reasons, data, experience, a principle – and is written Chinese, the language of reports and announcements.

Inside a noun phrase

With 的, a 基于 phrase describes a noun: a film based on a true story, a method based on data.

是基于…的

To say what a conclusion or suggestion rests on, put 基于 in a 是…的 frame with the verb at the end.

基于 or 根据

根据 is "according to" – it cites a source of information or a rule to follow. 基于 gives the ground something stands on. A person's words are a source, so they take 根据 or 据.

• × 基于他说，明天会下雨 → 根据他说的，明天会下雨 / 据他说，明天会下雨
• × 基于地图，往左走 → 根据地图，往左走