knows a lot about
Él no sabe mucho sobre Japón.
He doesn’t know much about Japan.
Se sabe mucho sobre alguien por su ropa interior.
You can tell a lot about someone from their underwear.
Tom dice que él no sabe mucho sobre Boston.
Tom says that he doesn't know much about Boston.
Tom no sabe mucho sobre música.
Tom doesn't know much about music.
Tom sabe mucho sobre Australia.
Tom knows a lot about Australia.
Ella sabe mucho sobre la moda actual.
She knows a lot about current fashion.
Tom sabe mucho sobre la historia de América.
Tom knows a lot about American history.