Explanation
Used to highlight a certain circumstance; 'when it comes to...', 'if it becomes...', 'in the event that...'.
Formation
Verb-casual + となると / い-Adjective + となると / な-Adjective + だとなると / Noun + だとなると
Detailed explanation
The ～となると grammar point highlights a specific situation or condition and indicates what normally or naturally happens under that circumstance. It can be translated as 'when it comes to...', 'if it becomes...', or 'in the event that...'.
Examples
Shiken to naru to, ooku no gakusei ga kinchou suru.
When it comes to exams, many students get nervous.
Toukyou e hikkosu to naru to, seikatsuhi ga ikki ni agaru.
If you move to Tokyo, the cost of living goes up drastically.
Shimekiri ga ashita to naru to, konya wa tetsuya ni narisou da.
If the deadline is tomorrow, I’ll probably be up all night.
Kare ga riidaa to naru to, chiimu no katsudou wa ookiku kaizen sareru kamoshirenai.
If he becomes the leader, the team’s activities might improve significantly.
Practice
Grammar content sourced from hanabira.org.