YOU SAID:

I wanna have a cup of coffee

INTO JAPANESE

私はコーヒーを飲みたいです

BACK INTO ENGLISH

I want to drink coffee

INTO JAPANESE

コーヒーが飲みたい。

BACK INTO ENGLISH

I'd like a cup of coffee.

INTO JAPANESE

コーヒーが飲みたい。

BACK INTO ENGLISH

I'd like a cup of coffee.