Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Chapter | Chinese | Pinyin | Translation | Subject |
| --- | --- | --- | --- | --- |
| 1.0 | 釋詁 | Shigu | Explaining the Old [Words] | verbs, adjectives, adverbs, grammatical particles |
| 2.0 | 釋言 | Shiyan | Explaining Words | verbs, adjectives, adverbs |
| 3.0 | 釋訓 | Shixun | Explaining Instructions | adjectives, adverbs, mostly with reduplication |
| 4.0 | 釋親 | Shiqin | Explaining Relatives | kinship, marriage |
| 5.0 | 釋宮 | Shigong | Explaining Dwellings | architecture, engineering |
| 6.0 | 釋器 | Shiqi | Explaining Utensils | tools, weapons, clothing, and their uses |
| 7.0 | 釋樂 | Shiyue | Explaining Music | music, musical instruments, dancing |
| 8.0 | 釋天 | Shitian | Explaining Heaven | astronomy, astrology, meteorology, calendar |
| 9.0 | 釋地 | Shidi | Explaining Earth | geography, geology, some regional lore |
| 10.0 | 釋丘 | Shiqiu | Explaining Hills | topography, Fengshui terms |
| 11.0 | 釋山 | Shishan | Explaining Mountains | mountains, famous mountains |
| 12.0 | 釋水 | Shishui | Explaining Rivers | rivers, navigation, irrigation, boating |
| 13.0 | 釋草 | Shicao | Explaining Plants | grasses, herbs, grains, vegetables |
| 14.0 | 釋木 | Shimu | Explaining Trees | trees, shrubs, some botanical terms |
| 15.0 | 釋蟲 | Shichong | Explaining Insects | insects, spiders, reptiles, etc. |
| 16.0 | 釋魚 | Shiyu | Explaining Fishes | fish, amphibians, crustaceans, reptiles, etc. |
| 17.0 | 釋鳥 | Shiniao | Explaining Birds | wildfowl, ornithology |
| 18.0 | 釋獸 | Shishou | Explaining Beasts | wild animals, legendary animals |
| 19.0 | 釋畜 | Shichu | Explaining Domestic Animals | livestock, pets, poultry, some zoological terms |
Question:
Name the subject of shiyan
Answer:
verbs, adjectives, adverbs