who whom whose which定语从句中怎样区分

who 表明先行词是人（一般在从句中充当主语）
The boy who plays computer well is waitting for you.
whom 也表明先行词是人（一般在从句中充当宾语）
The boy who I met yesterday is waitting for you.
whose 表明先行词是人或物（是代词的所有格）
指人 The boy whose mum is a doctor is waitting for you.
指物 The car whose owner is a doctor was lost.
which 表明先行词是物（也指事）在限定性定语从句中=that,在非限定性定语从句中只能which
This is the hotel which/that you will stay in.
Tom is late for class,which makes his mum very angry.
Beijing,which ia the capital of China,is a beautiful city.
打了这么多字,