biographical film on
/ˌbaɪəˈɡræfɪkəl fɪlm ɒn/
noun phrase
-
A film about the life of a real person, usually followed by the person’s name or subject; “biographical film about” is more common in everyday English.
B2followed by a person or subject
- "They watched a biographical film on Nelson Mandela."B1
Common mistakes
- a biographical film on→a biographical film about
“About” is generally the more natural preposition in everyday English, although “on” is also possible, especially in formal writing or titles.