a good film on的用法和样例：
- We saw a good film on TV last night.
- Let's go to the cinema-there's a good film on this week.
- It's not a good film, but it's good for a laugh.
- It's quite a good film, but it's nothing to rave about.
- I saw a good film at the cinema yesterday.
- I don't see why not,as long as it's a good film.