The Group 2 passive looks identical to the potential (食べられる). Context, and the に marking the doer, tell them apart.
Short answer: the Japanese passive turns “A did something to B” into “B had something done by A”: 私は先生に褒められました, “I was praised by the teacher”. Group 1 verbs move to the a-row + れる (書く → 書かれる); Group 2 verbs take られる. Japanese also has a passive English lacks: the suffering passive, for things that happen to you against your wishes, even with intransitive verbs: 雨に降られた, “I got rained on”.
Forming the passive
Every passive verb is itself a Group 2 verb: 書かれます, 書かれない, 書かれた.
Passive
Meaning
From
kakareru
be written
書く
yomareru
be read
読む
iwareru
be told, be said
言う (う → わ)
nusumareru
be stolen
盗む
taberareru
be eaten
食べる
sareru
be done
する
korareru
have someone come (on you)
来る
The direct passive
The one English has: someone does something to the subject. The doer is marked with に.
Saifu o nusumaremashita.“My wallet was stolen.”Why:Japanese says “I had my wallet stolen”: the owner is the subject, the wallet keeps を.
The suffering passive
Japanese uses the passive to say that an event affected you, usually badly. The thing that happened to you can even be someone else doing something to their own belongings, or the weather.
帰りkaerion the way homeにni(time)雨amerainにniby降られましたfuraremashitawas rained on
Kaeri ni ame ni furaremashita.“I got caught in the rain on the way home.”Why:降る cannot have an object, but the passive still works: the rain happened to me.
Tonari no hito ni yoru sawagarete, nemurenakatta.“The neighbours were noisy all night and I couldn’t sleep.”Why:騒ぐ (make noise) → 騒がれる: their noise was done to me.
子供kodomochildにniby泣かれてnakaretehad cry on me困りましたkomarimashitawas at a loss
Kodomo ni nakarete komarimashita.“The child started crying and I didn’t know what to do.”Why:The passive adds “and it was hard on me”.
によって: by, in formal passives
For creators, inventors and official actions, the doer takes によって instead of に.
The passive as respect
The passive form also works as light keigo for someone else’s actions: 先生が来られました, “the teacher came”. It is neutral, polite and common in business.
部長buchōthe managerはwa(topic)もうmōalready帰られましたkaeraremashitawent home (respectful)
Buchō wa mō kaeraremashita.“The manager has already gone home.”Why:Passive form used as respect, not passive meaning.
何時nan-jiwhat timeにniat来られますかkoraremasu kawill you come? (respectful)
Nan-ji ni koraremasu ka.“What time will you be coming?”Why:Context shows it is respect, not potential.
このkonothis本honbookをo(object)読まれましたかyomaremashita kadid you read? (respectful)
Kono hon o yomaremashita ka.“Have you read this book?”Why:Softer than いらっしゃる-style keigo; good for colleagues.
Passive of feeling and thinking
Some verbs in the passive express things that come to mind by themselves: 思われる (it seems), 感じられる (it feels).
Check yourself
Try each one, then open the answer to check and hear it.
passive of 書くShow answer
kakareruGroup 1: a-row + れる.
passive of 食べるShow answer
taberareruGroup 2: + られる.
I was praised by the teacher.Show answer
Sensei ni homeraremashita.The doer takes に.
My wallet was stolen.Show answer
Saifu o nusumaremashita.The owner is the subject.
I got caught in the rain.Show answer
Ame ni furaremashita.The suffering passive.
Passive in news and writing
Impersonal passives describe facts, history and general opinion.