mondai

Usages of mondai

もんだい ない、 だいじょう だ よ。mondai nai, daijoubu da yo.
No problem, it's okay.
それ は わたしたち の あいだ の おおきな もんだい だった。sore wa watashitachi no aida no ookina mondai datta.
That was a big problem between us.
テスト の もんだい は ぜん むずかしかった。tesuto no mondai wa zenbu muzukashikatta.
All test questions were difficult.
むずかしい もんだい だ なあ。muzukashii mondai da naa.
It's a difficult problem.

なあ is used here to express reflection or thoughtfulness

さけ を みすぎて、 もんだい を こしました。osake o nomisugite, mondai o okoshimashita.
He drank too much alcohol and caused a problem.

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How do verb conjugations work in Japanese?
Japanese verbs conjugate based on tense, politeness, and mood. For example, the polite present form adds ‑ます to the verb stem, while the past tense uses ‑ました. Unlike English, Japanese verbs don't change based on the subject — the same form works for "I", "you", and "they".

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