The passive: describing the affected side
The same event can be described through its actor or the person affected. Read the passive ending together with the person marked by に.
Forming the passive by verb group
For group 1, use the a-row form plus れる: 読む → 読まれる and 話す → 話される. Verbs ending in う take わ, as in 買う → 買われる. For group 2, replace る with られる: 食べる → 食べられる. The polite forms are 読まれます and 食べられます.
する becomes される, and 来る becomes 来られる（こられる）. A form such as 食べられる can also express potential, so its ending alone does not tell you whether someone can do something or is affected by an action.
The actor and the affected person
先生が私の名前を呼びました。 means the teacher called my name. 私は先生に名前を呼ばれました。 describes the event from my side, as the person whose name was called. The teacher is still the person who called it.
In this basic passive sentence, 先生に identifies the actor. I can remain the topic with は, while my name remains the object of 呼ぶ with を. Forming a passive is not simply reversing the order of the words.
A passive does not always imply harm
先生にほめられました。 means I was praised by the teacher, which may be a welcome experience. Read pleasure or displeasure from the verb and situation; a passive ending does not itself make the event negative.
雨に降られました。 can describe being caught in the rain and affected by it. First identify who was affected and by what, then consider whether the sentence merely reports an event or also conveys inconvenience.
Check: In 私は先生に呼ばれました, who did the calling?
Show the answer and why
The teacher did. 私 is the person called, and 先生に identifies the caller. Do not read 呼ばれました as a potential form meaning that I was able to call the teacher.