Combine the sentences using defining relative clauses. Make any necessary changes:
1. The site is really interesting. John sent me to the site.
2. The man lives next door to me. He designs websites.
3. Paul took us to the park. He plays football there.
4. The photo is not clear. Tom posted the photo on Facebook.

1. The site that John sent me to is really interesting.

In this sentence, we are combining the two sentences and using a defining relative clause to give more information about the site. The relative pronoun "that" is used to connect the two sentences, and the phrase "John sent me to" becomes part of the relative clause.

2. The man who lives next door to me designs websites.

Here, "who" is the relative pronoun used to combine the two sentences. The phrase "next door to me" becomes part of the relative clause.

3. Paul, who plays football there, took us to the park.

In this sentence, the relative pronoun "who" is used to combine the two sentences. The phrase "plays football there" becomes part of the relative clause.

4. The photo that Tom posted on Facebook is not clear.

Here, we use the relative pronoun "that" to connect the two sentences. The phrase "Tom posted the photo on Facebook" becomes part of the relative clause.

By using defining relative clauses, we can combine these sentences and provide additional information in a clear and concise manner.