なければなりません (nakereba narimasen)
Meaning: Must
Explain:
This sentence pattern indicates that an object must do something regardless of the object’s intention to take action. Note that this sentence pattern has no negative meaning
Example sentences:
1, 薬を飲まなければなりません。
Kusuri o noma nakereba narimasen.
I have to take medicine.
2, 毎日一時間日本語を勉強しなければなりません。
Mainichi ichijikan nihongo o benkyō shinakereba narimasen.
You must study Japanese for an hour every day.
3, 先生は英語が分かりません、日本語が話さなければなりません。
Sensei wa eigogawakarimasen, nihongo ga hanasanakereba narimasen.
Teachers do not know English, so must speak Japanese