JLPT N3 Grammar

Grammar form · 文法形式の判断

Choose the correct expression for the blank.

電気がついている。だれか部屋にいる（　　）。

漢字をタップで読み方 · tap a kanji for its reading & to save it for review

解答と解説 · Show the full answer & explanation

訳 · Translation

The light is on. Someone must be in the room.

正解 · Answer

にちがいない

解説 · Why

〜にちがいない draws a near-certain conclusion from evidence — here, the light being on.

誤答 · Why the other options are wrong

わけがない — That denies the possibility.

ことにした — That expresses a decision.

かもしれない — That is far weaker than the evidence warrants.

語彙 · Breakdown

〜にちがいない—must be, no doubt ~

〜かもしれない—might ~

例文 · Example

彼は知っているにちがいない。

Kare wa shitte iru ni chigainai.

He must know.

配点 · Points & details

Est. points1 pt

DifficultyMedium

Avg. time30 sec

Correct rate50%

Appears in文法形式の判断

AddedAug 2026

出典AI draft · human-reviewed

This question was drafted by AI and audited by human reviewers. Official JLPT scoring is scaled (0–60 per section); point values here are catalogue estimates.

衆智 · Community check2 attempts

50%of attempts answer correctly

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