Converting the words from informal writing to formal writing would be:
- They bought a wonderful house around the corner
- There were a huge gathering of people at the museum
- Jane is not going to tell anyone
- Oscar was scared about the test
- When the police came, the thief ran outside
- He checked his phone for any messages.
A formal writing has to do with language or diction which is used among people who the speaker is not very close to and is used in official occasions.
With this in mind, we can see that some of the words in the image such as "cop", "crook", "Ain't", etc are all informal words which should be changed to more formal ones.,
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