Actually "I want that" doesn't mean "sore kudasai". "sore kudasai" => (please) give me that "sore hoshii" => I want that □ I want that: <casual> sore hosii　（それ欲しい） <formal> sore ga hoshii desu (それが欲しいです） □ give me that (please): <casual> sore cho-dai　（それ頂戴） <formal> sore wo kudasai　（それを下さい） But generally we are apt to say "I want this" as a question. It would be the same as English. For instance, people tend to say "May I have it?" instead of saying "please give me that". In Japanese, most of the time, we use the same way as they are. Below are the examples. □ give me that => May I have this? <casual> kore moraeru? (これ貰える？） <formal> kore wo itadake masuka?　（これを頂けますか？）

Je voudrais connaître la forme de phrase pour dire je veux... Par exemple :" Je veux manger"

Salut, Elise! Je n´ai pas compris ce que tu voudrais savoir. La construction de "kore/sore/are ô kudasai" (donne moi celui-ci/là) est parfaite! Tu pourrais aussi dire "kore/sore/are ga hoshii-desu" (je veux celui-ci/là), mais la première forme est plus commun!