Please help me translate some Japanese for traveling to Japan.

Because you can't speak Japanese, I'll try my best to tell you something simple and use simplified words. Anyway, as a guest, you don't need honorifics or anything, as long as the other party understands.

Just try it. Let's have a try. (shichaku shitemoiika？ )

すみません, ぉぉぃ. Demarcation Sumimasenn, kannjyouonegai. You said the waiter would come.

Duty-free goods. (Mensensin Ga Arouca)

English, Chinese, Chinese? (eigo ka tyuugokugo ga dekiru？