~れる/られる(tự phát)
arise spontaneously
Explanation
Express emotions, thoughts, or actions that arise naturally or unintentionally.
Examples
1この歌を聞くと、子どものころのことが思い出される。
This song reminds me of my childhood.
2国から送られてきた荷物を見ると、母のことが思われる。
When I see the package sent from my country, I think of my mother.
3田舎で一人暮らしをしている祖母のことが案じられる。
I'm worried about my grandmother, who lives alone in the countryside.
4妹の病気は現代医学では治すことが難しいそうだ。新薬の完成が待たれる。
My sister's illness is said to be difficult to cure with modern medicine. A new drug is eagerly awaited.
Note
1) Easily mistaken for the ordinary passive (someone is done by someone).
→ Here ~れる/られる expresses naturally arising emotions/thoughts (spontaneous), not emphasizing the agent.2) Often occurs with verbs like 思われる・思い出される.
→ Means 'naturally feel/remember/worry...'.3) Not used to indicate a specific victim.
→ If a clear agent exists (A does B), use ordinary passive.