Grammar Info
N2 Lesson 8: 2/22

のも当然(とうぜん)だ
it is only natural that, it is no wonder

Structure
Casual
Polite
Verb + (1) + 当然

[い]Adjective + (1) + 当然

[な]Adjective + (1) + + 当然

Noun + (2) + 当然

(1)
(2)
Verb + (1) + 当然 + です

[い]Adjective + (1) + 当然です

[な]Adjective + (1) + + 当然 + です

Noun + (2) + 当然です

(1)
(2)
Details
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Information
Like て当然(とうぜん)だ, the grammar point indicating that (A) is ‘natural’ or ‘obvious’, のは当然(とうぜん)だ works in a similar way, and highlights that it is ‘no wonder that (A)’, or ‘it is only natural that (A)’.
This construction will be seen following verbs and い-Adjectives, or な-Adjectives and nouns that are followed by な.
  • 会社(かいしゃ)のお金(かね)を勝手(かって)に使(つか)ったなら、クビになるのは当然(とうぜん)だ
    If you did use company money without permission, it’s only natural that you get fired.
  • このタワーマンションは六本木(ろっぽんぎ)にあるので、家賃(やちん)が高(たか)いのは当然(とうぜん)です
    This high-rise condo is located in Roppongi, it is only natural that the rent is expensive.
  • おばあちゃんは毎朝(まいにち)10キロも散歩(さんぽ)しているから元気(げんき)なのも当然(とうぜん)だ
    My grandma walks 10 kilometers every morning, so it is no wonder she is so healthy.
  • この1年間(ねんかん)全然(ぜんぜん)勉強(べんきょう)をしてこなかったから落第(らくだい)も当然(とうぜん)だ
    I have not studied at all for the past year, so it's no wonder I flunked out.
As can be seen in several of the above examples, も may replace は, with only a slight change in nuance (も will place extra emphasis on the obviousness of the remark, according to the speaker).
Compared to て当然(とうぜん)だ, のは当然(とうぜん)だ is slightly stronger, and separates the previous statement from what the speaker considers ‘natural’. This is equivalent to the difference between ‘being happy is natural’ (slightly weaker), and ‘it’s natural that one would be happy’ (slightly stronger) in English.
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彼(かれ)はあんな風(ふう)に振舞(ふるま)っていたらほかの人(ひと)からの受(う)けが悪(わる)いのも当然(とうぜん)だ
If he is behaving like that, it is only natural that he is unpopular with other people.
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その古(ふる)い、枯(か)れた木(き)はとうとう倒(たお)れたのも当然(とうぜん)だ。そんな長(なが)い間(あいだ)立(た)っていたのはおどろくほどだ誰(だれ)も怪我(けが)をしなくて嬉(うれ)しい
It is no wonder that old, withered tree has finally fallen. It is surprising that it had been standing for such a long time. I am glad that no one was hurt.
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久(ひさ)しぶり彼(かれ)に会(あ)ったのだから彼女(かのじょ)が嬉(うれ)しそうのは当然(とうぜん)だ
Since she got to see him after being apart for a while, it is only natural that she seems happy.
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