最近在英文考卷上看到一個句子：You should save the dessert for after dinner. 請問真的有外國人會這樣用嗎 for是介系詞after也是介系詞 我是覺得蠻奇怪的?

for 後應加名詞，after dinner不是名詞。
原句應是省略 the time 而成。
原句可還原為
You should save the dessert for the time after dinner
"after dinner"，不用多說，大家都知道指"時間"即the time after dinner，是省去"時間""the time"而來。
the time 是名詞，after dinner是the time 的補述語。

Prepositional phrase can sometimes act as noun.
For example:
"Under the table" is a good place to hide.
"After dinner" is a good time to take a walk.

You should save the food for tomorrow.
"tomorrow" is a noun, acting as the object of the preposition "for".

You should save the dessert for after dinner.
"after dinner" is a noun phrase, acting as object of preposition "for".

你有沒有漏掉after-dinner中間的小橫橫啊?
有的話after-dinner是形容詞.在這裡當名詞用.是指"特意拿來在晚餐後使用的(行為,食物,或是遊戲)

1，介詞後加介詞如:into,onto等，均連在一起當一個介詞用，餘均不合文法規則
2，本句save for 是動詞片語，其受詞可置中或置後，所以寫成：You should save for the dessert after dinner. 較易明瞭，但若是代名詞：You should save it for after dinner. 就錯誤了。本句意思應將甜點在晚餐後食用，就是如此。

for=for the purpose of.

google 一下嘛!就知道有沒有
這是找到的句子
Satisfy your sweet tooth with our recipes for after-dinner treats, including cookies, cakes, and pies. ...
after-dinner 是形容詞 形容詞為何可以作名詞解呢?英文跟中文不同
英文格位是固定的
after dinner 明明就是副詞表時間 為何突然可以為了for 主動更改為名詞? after 表時間或者方位的介係詞 介係詞片語在句子中屬於副詞 沒有作名詞的介系詞片語 介係詞片語就是作副詞用而已
對 沒有在網路上找到這個句子
應該不行!!!

《文法》after：[adj.形容詞] 釋義1. archaic Later. 例.He was sorry in after years.
# after：[adj.] 釋義1. 以後的 例. His health was declining in after years. (在以後的歲月，他的健康不斷衰退。)
本題：You should save the dessert for[介係詞] after[形容詞] dinner[名詞]. ←← for "after + dinner" 符合文法、正確的句子。
《辭典例句》例1. About my plans for after this...
例2. for after winter cometh summer, after night returneth day,
なぜなら、冬の後は夏が、夜の後には昼が訪れるから
例3. I decided on my job for after I graduate.
卒業後の仕事を決めた。 -
例4. X is for after the age of forty.
Xが四十歳を過ぎてからだ
例5. I rescheduled the welcome party for after the summer vacation.
私は歓迎会を夏休みの後に変更した。