Note: English is not my first language. All mistakes are mine.
Lesson #1: He talks a lot
He always was talkative, but Rose knew it was because of his high Time Lord intelligence. His super brain couldn't stop working.
But now he is human. And human people don't control their nerves. Therefore, Rose has suspected that when he talks a lot, really a lot, is because he is nervous. Rose thanked Heaven on their wedding day just because they were in separated rooms until the time of the ceremony. Poor Pete had to endure by hours John's stories about when he was a Time Lord and almost got married sometimes unintentionally.
Rose loves him anyways. Even if he sounds as Donna Noble.
