Did you "enjoy" your dance lesson today?
Did you have a "ball" at the party?
Did you have a "blast" at the carnival?
"Enjoy" is a verb that means taking delight or pleasure in an activity or occasion. "Ball" is a noun and means you are having a good time. A "ball" is a somewhat dated use of the word referring to a formal dance, get together or celebration where the aim is to "enjoy" yourself. Therefore to have a "ball" means to have "fun". Have a blast is an idiom, which means to have "fun" or an exciting time doing something.
Did you "enjoy" your dance lesson today?
〔訳〕今日のダンスレッスンは楽しかった？
Did you have a "ball" at the party?
〔訳〕パーティーは楽しかった？
Did you have a "blast" at the carnival?
〔訳〕カーニバルは楽しかった？
「enjoy（＝動詞）」は、その場、アクティビティを楽しむという意味です。
「ball（＝名詞）」は楽しい時間を過ごすことを表します。
この「ball」は、フォーマルなダンスパーティー、パーティー、祝賀会を表しますが、少し古めかしい用法です。「have a ball」は「have fun（楽しむ）」という意味になります。
「have a blast」は「（何かをして）楽しむ」という意味のイディオムです。
The first two answers are both questions as indicated by the question mark. 'Enjoying' and 'good time' are two different words or phrases that are the same as the word 'fun'.
The third sentence is not a question but a statement. In reply the child could smile or say that yes they are having fun. Sometimes a verbal answer will not be needed but you could tell by their body language how they feel.
最初の二つは質問です、クエスチョンマーク（？）が付いてますね。
「Enjoying」と「good time」は「fun」と同じ意味です。
三つ目の例は質問ではなく平叙文です。これを言われたら、子どもは、笑ったり、「うん、楽しいよ（Yes, I'm having fun）」とか答えるかもしれません。返事を口に出して言わなくていい時もあります。ただ、ボーディランゲージで気持ちは分かります。
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