
Prepositions of place indicate where something is located.
- in (inside...), on (on top of... / surface), under (below...)
(冠词)The 钥匙keys 在are 在...里in (冠词)the 包里bag.
The key is in the bag.
(冠词)The 书book 在is 在...上on (冠词)the 桌上table.
The book is on the table.
(冠词)The 猫cat 在is 在...下under (冠词)the 椅子下chair.
The cat is under the chair.