In this lesson, I will introduce you the expression using んです, which is used to explain things.
んです follows plain form of verbs, adjectives, and nouns.
<Example Sentences>
In response to the utterance, "You look tanned!"
ハワイ に いったんです。
I went to Hawaii.
*いった is past tense plain forms of いく, go
*んです explains the reason why you look tanned.
どうして きのう パーティ に こなかったんです か。
Why didn't you come to the party yesterday?
きのう は おきゃくさん と うちあわせ が あったんです。
I had a meeting with a customer yesterday.
If you were Chinese, and someone talk to you in Japanese, you can say,
ちゅうごくじんなんです。
I am Chinese.
In response to your neighbor's utterance, "Your dog runs fast!",
げんきなんです。
He is healthy.
どうしたんですか。
What happened?
あたま が いたいんです。
I have a headache.
References:
Introduction to Plain Forms
https://anchor.fm/yuya-sato/episodes/Introduction-to-Plain-Forms-enp0g3
Plain Forms in Past Tense
https://anchor.fm/yuya-sato/episodes/Plain-Forms-in-Past-Tense-eoe8fp
Describing a Person's Feature
https://anchor.fm/yuya-sato/episodes/Describing-a-Persons-Feature-ennovs
Adjectives
https://anchor.fm/yuya-sato/episodes/Adjectives-en9o8v
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