"The boy speaks on the phone."

Translation: A fiú telefonál.

[ohsweetwoods]

Why is "A fiú telefonál besélsz" not correct?

[Shamarth]

"Telefonál" is a verb in itself, meaning "to speak on the phone".

"Beszélsz" is conjugated in second person singular, so it doesn't match the subject here.

You could say "a fiú a telefonnál beszél" -- "the boy is talking next to the phone", but that doesn't mean he's using the phone: he just happens to be standing next to it, while simultaneously talking to somebody.

[mizinamo]

What about a telefonnal beszél (with -val ending)?

[Shamarth]

It means he's talking to the phone; it wouldn't be used to express talking by means of a phone.

[unicornflowerx]

what you wrote means " the boy is speaking on the phone you speak "

[BobHolmes4446]

I wrote A fiú telefonon beszél. Is this not correct?

[Shamarth]

It is, report it.

[HaggaiKova]

Why a fiú beszél telefononok" is not correct? I thought if the order is not SOV than the object marker (-k) has to be applied to the object.

[Mala44]

Jeszzus mik ezek a kérdések?? xD

[guntunge]

You mean the plural marker -k?

that would be "a fiú telefonokon beszél".
"The boy speaks on phones."