Verbs and their passive form

I wrote a few sentences in order to review passive form. I find it to be one of the more difficult grammar points in the Korean language.

Some verbs can be changed into a passive form by adding:  -이/하/리/기

Here's a list of active/passive verbs.

Note:  If you're studying for TOPIK - intermediate there's usually only one question in the grammar that tackles this concept directly.  If you want you can memorize the passive forms of common verbs.  In my opinion it's more important to simply be able to recognize the format when you come across it while reading.  There are other/easier ways to make verbs passive, such as -게 되다 or 아/어지다.

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verb:  물다 - to bite - 

passive form:  물리다 - be bitten

ex)  아이가 강아지에게 물렸다.
The child was bitten by the puppy.

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verb:  먹다 - to eat

passive form:  먹이다 - to be eaten

제가 가지고 왔던 케이크를 다 먹였네요.
The cake that I brought was all eaten.

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verb:  걸다 - to hang

passive form:  걸리다 - to be hung

저기 걸려 있는 시계는 얼마예요?
How much for the clock that's hanging there?

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쌓다 - to pile

쌓이다 - to be piled

눈이 많이 쌓여서 운전할 수 없는 모양이에요.
The snow is all piled up so it's looking like it won't be possible to drive.

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보다 - to see

보이다 - to be seen

집 뒤로 보이는 산은 너무 아름답습니다.
The mountain that can be seen behind the house is beautiful.

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바꾸다 - to change

바뀌다 - to be changed

선생님께서 일정이 바뀌었다고 말씀하셨다.
Teacher said that the schedule had been changed.