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You need to wash your hands before eating. The sentence in the picture says this is something you must do.

Lesson notes · ≈ JLPT N4 · Beginner 2

〜なければなりません~nakereba narimasen

must do

Use this form to say an action is required by a rule, responsibility, or practical need.

How it works

You need to wash your hands before eating. The sentence in the picture says this is something you must do.
Although the sentence contains 「ない」 and 「ません」, the whole expression still means “must do.”
Remove the final 「ない」 from the verb’s ない form, then add 「なければなりません」.
Removing 「ない」 from 「しない」 leaves 「し」, so it becomes 「しなければなりません」.
Rules, responsibilities, or practical needs can all make something a “must-do” action.

These two sentences require washing your hands and taking off your shoes. The 「てはいけません」 you learned earlier expresses a prohibition.

手てteをo洗わなけれあらわなけれarawanakereばbaなりません。なりませんnarimasen
You must wash your hands.
靴くつkutsuをo脱がなけれぬがなけれnuganakereばbaなりません。なりませんnarimasen
You must take off your shoes.

A
神社じんじゃに行くいく時、とき何なにをしなければなりませんか。か
A: What do you have to do when going to a shrine?
B
鳥居とりいをくぐってから、からお辞儀おじぎをしなければなりません。なりません
B: After passing through the torii gate, you must bow.