Someone parked an old car outside the concert hall 这句怎样改被动语态

Someone parked an old car outside the concert hall 这句怎样改被动语态,知道请回答,
还有一句：
Someone cleans the first floor of the building everyday
也改成被动语态,

An old car was parked outside the concert hall by someone.
The first floor of the building is cleaned by someone everyday.
被动语态就是把宾语(the first floor of the building)提前将谓语改成被动语态形式[be done]然后再加by加主语[someone].
要注意的是一般形式的修饰性副词应提前到谓语前面,但是像everyday,everywhere等同类的副词则不改变其位置.

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