on

• 表示位置在某物之上或表面接触；也表示时间、方式、状态、依据、涉及对象等关系。

The preposition 'on' indicates position on a surface, time (days, dates), means of transport, means of communication, direction, reason, topic, membership of a group, source of livelihood and other relations.

1. Position on a surfaceA1formal

   Indicates the position of something touching or covering the surface of another thing.

   在……上

   • a picture on a wall
   • Put it down on the table
   • There's a mark on your skirt

2. Time: days and datesA1formal

   Used with specific days of the week, dates, holidays and special days.

   在（用于星期、日期和节日）

   • He came on Sunday
   • on May the first
   • on your birthday

3. Means of transportA2formal

   Indicates the vehicle or kind of transport by which someone travels.

   乘坐

   • He was on the plane from New York
   • to travel on the bus
   • I came on my bike

4. Means of communication or mediaA2formalIT

   Indicates the device, platform or medium through which information is received or communication takes place.

   通过，用，在……上

   • The information is available on the internet
   • We spoke on the phone
   • What's on TV?

5. Direction or locationA2formal

   Indicates a side, a direction or closeness to a particular place.

   在…上；朝；向

   • on the left/right
   • a town on the coast
   • a house on the Thames

6. Basis or reasonB1formal

   Indicates the basis, reason or source for an action or a statement.

   根据，由于，基于

   • a story based on fact
   • On their advice I applied for the job