Grammar Info
N1 Lesson 1: 11/17

となると
when, if, once, as

〜なったら is also used. Often in casual speech.

Structure
Noun + (1) + + なる(2)
Verb[る]+ + + なる(2)

(1)
(2) なれば
Details
Register Standard
使用域 一般
Information
  • [AともなるとB is used to express the opinion of the speaker/writer (often with はず・だろう, etc) that something (B) is the case when condition A is realized]
  • [A is often certain age, unusual phenomenon, occupation.]
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ここ普通(ふつう)の漁村(ぎょそん)だが、夏休(なつやす)みともなる大勢(おおぜい)客(きゃく)が来(き)て、賑(にぎ)やかになります。
This is an ordinary fishing village, but when the summer vacation starts, a large number of visitors come and it becomes lively.
AがBともなるとC is a very common pattern expressing what happens (C) when B (some special circumstances like an emergency) happens. A is often an ordinary situation, or current stage in life, etc.
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田中(たなか)さん普通(ふつう)のサラリーマンだが、危(あぶ)なくて後(あと)が無(な)い状況(じょうきょう)ともなる獅子(しし)のように他(た)の人(ひと)を守(まも)る。
Tanaka-san is just an ordinary office worker, but when the situation is dangerous and there is no way out, he will protect others like a lion.
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大人(おとな)にもなる、幼馴染(おさななじみ)との友情(ゆうじょう)は弱(よわ)くなりつつあるだろう。
Once you become an adult, the bond with childhood friends gets weaker and weaker.
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