N2 · Structured courses

~ni Soui Nai: Without Doubt

Learn ni soui nai — the hard written version of ni chigai nai for strong assertion. This lesson combines form, context, examples, common mistakes, and practice so you can use the pattern in real communication.

12 minNihongo Hub Editorial TeamPublished 2026-06-06Updated 2026-06-06

Learning objectives

  • Lesson goals: Learn ni soui nai — the hard written version of ni chigai nai for strong assertion.
  • Form and connection: [Noun/Plain form] に相違そういない
  • Nuance in real use: 相違 itself is a kanji word meaning "difference/discrepancy" — 相違ない literally means "there is no difference / no mistake." This expression wraps a judgment in an unquestionable mantle.

Form and connection

[Noun/Plain form] に相違そういない

Core Explanation

Learn ni soui nai — the hard written version of ni chigai nai for strong assertion.

Cultural Note

相違 itself is a kanji word meaning "difference/discrepancy" — 相違ない literally means "there is no difference / no mistake." This expression wraps a judgment in an unquestionable mantle.

Practical examples

The culprit is without doubt him.
This plan will without doubt succeed.
She is without doubt lying.

Common pitfalls

Build the base form before adding the pattern

Complete the required conjugation first. Do not keep polite and plain endings at the same time.

Match politeness to the situation

The examples are reliable starting points; relationships and context can still change the most natural wording.

Practice and answers

1. Write the connection formula for this lesson.
Show answer[Noun/Plain form] に相違そういない
2. Explain the meaning of the first example.
Show answerThe culprit is without doubt him.
3. Rewrite the final example using this lesson pattern.
Show answer彼女かのじょが嘘うそをついているに相違そういない。 ([Noun/Plain form] に相違そういない)

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