YOU SAID:

I wonder what's for dinner...

INTO JAPANESE

私は夕食のために何があるのだろう...

BACK INTO ENGLISH

I wonder what is for dinner ...

INTO JAPANESE

私は夕食のために何があるのだろうか...

BACK INTO ENGLISH

I wonder what is going to be for dinner ...

INTO JAPANESE

私は何が夕食になるのだろう...

BACK INTO ENGLISH

I wonder what will be dinner ...

INTO JAPANESE

私は何が夕食になるのだろう...

BACK INTO ENGLISH

I wonder what will be dinner ...