All JLPT grammar

N2

A。というのは B。(Toiu no wa~)

Give the reason for what was just said; 'that's because', 'the reason is'.

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At a glance

A。というのは、B。 gives the reason or explanation for something you just said. It is like "The reason is..." or "That's because..." in English.

A。というのは、B からだ / のだ。

明日あしたは休やすみます。というのは、病院びょういんに行いくからです。 I'll be absent tomorrow. That's because I'm going to the hospital.

How to form it

State A first. Then start the next sentence with というのは and give the reason. B usually ends with から or の.

Part	Where it goes	Register
というのは	Start of the sentence after A	Neutral, speech and writing
っていうのは	Start of the sentence after A	Casual speech
～からです / ～からだ	End of B	Polite / casual
～んです / ～のだ	End of B	Polite / casual

Examples

彼かれは非常ひじょうに疲つかれています。というのは、昨夜さくや、車くるまで遠とおくまで行いってきたためです。
He is very tired. The reason is that he drove a long way last night.
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The rest of the lesson

When to use it, common mistakes, nuances and a quick check, with spaced repetition to make it stick.

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