Learn Japanese grammar: なければいけない (nakereba ikenai). Meaning: must do something; have to do something.
To be more formal, use なければいけません (nakereba ikemasen).
It is used very similarly to some other lessons like:

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なければいけない - Example Sentences 例文
Each example sentence includes a Japanese hint, the romaji reading, and the English translation.
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Example #1
早く寝なければいけない。
Example #2
私も頑張らなければいけない。
Example #3
私はすぐ答えなければいけない。
Example #4
私は友人をもっと信頼しなければいけない。
Example #5
あなたはお昼までに宿題を終わらせなければいけない。
Example #6
学ばなければいけないことが実に多かった。
Example #7
私は自分の感情を隠さなければいけない。
Example #8
もう一つ、考慮しなければいけないことがある。
Example #9
あなた、彼にあなたの夢のことを話さなければいけませんよ。
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