Divorced, with a -d, functions as a past participle here,
- They decided to get divorced.
The problem with the sentences below is agreement,
- She is my best friends.
- I am her fans.
Those sentences have a copular structure; i.e., A = B,
- They are my best friends. <plural = plural>
- She is my best friend. <singular = singular>
- We are her fans.
- I am her fan.
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