YOU SAID:
i wonder whats for dinner...
INTO JAPANESE
夕食は何だろう...
BACK INTO ENGLISH
What's the supper ...
INTO JAPANESE
夕食は何ですか...
BACK INTO ENGLISH
What is supper ...
INTO JAPANESE
夕食は何時ですか。
BACK INTO ENGLISH
What time do you have supper?
INTO JAPANESE
夕食は何時ですか。
BACK INTO ENGLISH
What time do you have supper?
That didn't even make that much sense in English.