Example: Professor Wang is nearly ninety years old, and he is still tirelessly sorting out the history of ancient Chinese literature. He is a role model for young scholars. Commonly used degree: unusual emotional color: grammatical usage of commendatory words: as predicate and attribute; The structure of commendatory idioms: the time of subject-predicate formation: the modern orthographic idiom: Jing, which can't be pronounced as "j ì n"; Hao, you can't pronounce it as "bar". Idiom recognition: OK, you can't write "OK"; Classic, can't write "path". Idiom riddle: Never too old to learn.