SUFFIXES -VÁ, -VÉ

The name of the grammatical case for these suffixes is: translative case

You already know how -val, -vel behaves when attached to a word ending with a consonant. > COMPLETE ASSIMILATION

gyerek + –vel = gyerekkel (with child)
asztal + –val = asztallal (with table)

The same happens to these suffixes: -vá, -vé. Take a look at it:

gyerek + –vé = gyerekké
asztal + –vá = asztallá

And what do these suffixes express? A simple answer would be: it is equivalent to the English preposition into. However, it has nothing to do with going into a place.

It indicates:
-a change
-someone/something turns into something else

Examples with the words above:

Szeretnék megint gyerekké válni.
I’d like to become a child again.

A hercegnő hirtelen asztallá változott.
The princess suddenly turned into a table.

As you see, English doesn’t always reflect the Hungarian method. There is no preposition equivalent to -vé in the first sentence. I guess you see the point, so more examples on the way:

Porrá zúzták az épületet.
The building has been smashed to dust.

A fiú férfivá érett.
The boy has become a man.

A lakberendező széppé varázsolta a lakásomat.
The decorator changed my flat into a beautiful place.

Kővé dermedtem az ijedtségtől.
I was petrified with fear.

Tedd magad hasznossá!
Do something useful.

–Mivé változott a herceg? –Békává.
-What did the prince become? –A frog.

The suffixes -vá, -vé are not to be confused with -va, -ve for condition!!!