My hobby is collecting/to collect beautiful key rings.

[sitifan]

1. My hobby is collecting beautiful key rings. (my bold, Hanlin English, Book V, page 173)
2. My hobby is to collect beautiful key rings.
Is #2 also acceptable?

 

[dunchee]

Yes.

 

[5jj]

I would use only the -ing form

 

[jutfrank]

I consider #2 wrong.

 

[sitifan]

I consider #2 wrong.

Which of the following sentences is not acceptable, either?
3. Collecting beautiful key rings is my hobby.
4. To collect beautiful key rings is my hobby.
5. It is my hobby collecting beautiful key rings.
6. It is my hobby to collect beautiful key rings.

 

[jutfrank]

Which of the following sentences is not acceptable, either?

The ones with a to-infinitive. When you're talking about activities such as hobbies, use an -ing form.

 

[Holmes]

Which of the following sentences is not acceptable, either?
3. Collecting beautiful key rings is my hobby.
4. To collect beautiful key rings is my hobby.
5. It is my hobby collecting beautiful key rings.
6. It is my hobby to collect beautiful key rings.

Sentence (5) is bad in my book. Extraposition tends not to work well with "gerunds," though there are some exceptions -- e.g., "It's fun jumping on the trampoline."