Explanation
Emphasizes the reason or purpose for an action; 'in order to', 'for the sake of'.
Formation
Verb-negative stem + んがために
Detailed explanation
The ～んがために form is a formal/literary expression meaning 'in order to' or 'for the purpose of.' It attaches to the negative stem (ない-form minus ない) of the verb: e.g., する→せん, 行く→いかん, 保つ→たもたん, etc.
Examples
Kenkou o tamotan ga tame ni, mainichi undou o shite imasu.
I exercise daily in order to maintain my health.
Goukaku sen ga tame ni, isshoukenmei benkyou shimasu.
I study hard in order to pass.
Ashita no shiken ni sonaen ga tame, kon'ya wa hayaku neru tsumori desu.
I plan to go to bed early so I can prepare for tomorrow’s exam.
Kanojo no egao o min ga tame ni, mainichi ai ni ikimasu.
I go to see her every day in order to see her smile.
Practice
Grammar content sourced from hanabira.org.