sono kyoushitsu de nihongo o oshieru tsumori desu.

to be

Breakdown of sono kyoushitsu de nihongo o oshieru tsumori desu.

• を: direct object particle
• 日に本ほん語ご: Japanese (language)
• で: location particle

Questions & Answers about sono kyoushitsu de nihongo o oshieru tsumori desu.

Why does the sentence use その 教室 rather than この or あの 教室?

その refers to “that classroom” which both speaker and listener already know about (it’s been mentioned or is contextually obvious).

• この教室 would mean “this classroom” (closer to the speaker or speaker’s side).
• あの教室 would mean “that classroom over there” (far from both speaker and listener).

Why is the particle で used after 教室 instead of に?

Particles で and に both can mark locations, but they have different functions:

• で marks where an action takes place. Here, teaching happens in the classroom ⇒ 教室で
• に marks a point of arrival/existence or destination. E.g., 教室に行く (“go to the classroom”), 教室にいる (“be in the classroom”)

Why is 日本語 marked with を? Isn’t that the subject?

を marks the direct object of a transitive verb. Since 教える (“to teach”) takes a direct object (what you teach), 日本語を教える means “teach Japanese.” The subject (I/we) is omitted because it’s understood from context.

Why is the verb in dictionary form (教える) before つもりです instead of a polite form like 教えます?