must do, have to do

Drop the final i of the nai form and add kereba narimasen to express obligation: ikanakereba narimasen means I must go. Casual speech shortens it to nakya or nakucha. It states duties and necessities.

Examples

• 明日あす早はやく起おきなければなりません。

  Ashita hayaku okinakereba narimasen.

  I have to get up early tomorrow.

• 毎日まいにち薬くすりを飲のまなければなりません。

  Mainichi kusuri o nomanakereba narimasen.

  I must take medicine every day.

Vocabulary in these examples

• 明日 tomorrow
• 早い early
• 起きる to get up; to wake up
• なる to become
• 毎日 every day
• 薬 medicine

Related patterns · Permission, obligation, ability

• 〜てもいいです may do, it is okay to do (permission)
• 〜てはいけません must not do (prohibition)
• 〜ないでください please do not do
• 〜なくてもいいです do not have to do
• 〜ことができます can do, be able to do