Let's see what word formation is. A word is the smallest language unit that can be used freely. It consists of morphemes, which are monosyllabic, disyllabic and polysyllabic. Morpheme (including monosyllabic, disyllabic and polysyllabic) is a simple word. A compound word consists of two or more morphemes.

The composition of compound words in classical Chinese mainly includes:

(1) Parallel (wife-wife and children)

(2) Some procedures (luggage-business travelers)

(3) Leading (health-life support)

(4) Auxiliary (criss-crossing traffic)

(5) Statement (concrete-complete in form)

(6) Overlapping type (harmonious sound of Chen Wenjing-tea-warbler)