Japanese learners will find this blog post useful for understanding how to use the particle を. This is a great introduction to using particles in Japanese and some of the nuances that are important to know when trying to communicate with others.
Wo を is using it as a direct object marker, meaning that it marks the noun which receives an action or event described by a verb. For example,ご飯を食べます。 I eat rice. ご飯 is Object and 食べます is Verb. It is important to pronounce the particle を as “o”. The direct object of a verb always links it to that action, which makes its correct pronunciation more than necessary for clarity in communication. The word before を O must be Noun. Noun + を O
| direct object | object marker | verb |
| ラーメン | を | 食べました。 |
| Ramen | o | Ate |
In the above example, the underline Noun direct object which receives the action.
Example 例文
（1.私はテレビを見ます。 I watch TV.
（2.ラーメンを食べました。I ate ramen.
（3.日本語を勉強しています。 I am studying Japanese.
Let’s see more example and master How to use を O
今日は朝ごはんを食べませんでした。
Today, I didn’t eat breakfast.
山を登りました。
I climbed the mountain.
教科書を買いました。
I bought a textbook.