I recently officially learned that an infinitive can have a subject For + subject + to + verb.
For them to browse the Web is entertaining.
For Smith to turn down the job was a big surprise.
For Jones to return the favor meant a lot to us.
I am wondering whether this can be applied to other structures where an infinitive is used as an adjective. Do you think the sentences down below are correct use of subjects of infinitives?
Harry Potter series contains books for children to understand easily. (Children are the ones understanding easily.)
This is a touching film for me to watch, because it reminds me of my childhood.(I am the one watching the film.)
Tomorrow is the day for us to start working on the project. (We are the ones working on the project.)