をDeparture point
を marks a place, vehicle, or institution that someone or something leaves. It is used with established leaving verbs such as 出る, 降りる, and 離れる.
The place is left behind
The noun before を is the starting place of the movement: the person or thing crosses out of it or moves away from it. Although this is the same particle spelling used with objects, the place here is not something affected by the action.
Pronunciation
As a particle, it is written を but normally pronounced お.
Common leaving patterns
Learn the particle together with the leaving verb rather than treating it as a general marker meaning “from.”
Leaving a place versus moving through it
Departure-point を presents the marked place as something left behind. Route を instead marks the space through which movement occurs. The following sentence is the route use, not the departure use.
子どもたちが公園を走っている。
The children are running through the park.
AnalyzeThe park is the area of movement; the sentence does not say that the children leave it.
More examples
毎朝七時半に家を出ます。
I leave home at seven thirty every morning.
Analyze乗客は終点でバスを降りた。
The passengers got off the bus at the last stop.
Analyze危険なので、すぐ建物を離れてください。
It is dangerous, so please move away from the building immediately.
Analyze三月に高校を卒業しました。
I graduated from high school in March.
Analyze猫が箱を出て、窓のそばに座った。
The cat came out of the box and sat by the window.
Analyze船はゆっくり港を離れた。
The ship slowly left the harbor.
Analyze