1. It isn’t necessary to bring food because it is included in the package
→ You don’t
2. She isn’t very shy; that’s why she doesn’t enjoy parties
→ Unless
1. It isn’t necessary to bring food because it is included in the package
→ You don’t
2. She isn’t very shy; that’s why she doesn’t enjoy parties
→ Unless
=>
1. You don’t need to bring food because it is included in the package.
2. Unless she were very shy, she would enjoy parties.