核心畫面
Upon is basically a dressed-up 'on': one thing resting on the surface of another. From that picture of something settling onto a surface come the other uses — a time that is almost 'on top of' us, and layer stacked upon layer.
upon 可以想成一個比較正式、書面的 on：一樣東西落在另一樣東西的表面上。從「落在表面上」這個畫面，延伸出其他用…更多收起
upon 可以想成一個比較正式、書面的 on：一樣東西落在另一樣東西的表面上。從「落在表面上」這個畫面，延伸出其他用法——時間快「壓到頭上」了，以及一層又一層疊上去。原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
uponprep/əˈpɒn/
- 1
alternative to on in most, though not all, prepositional uses.
- A vase of flowers stood upon the table. — The painting hangs upon the wall. — All of the responsibility is upon him. — She plays upon a violin (or piano). — The lighthouse that you can see is upon the mainland. — He rested upon his elbows. — Tug upon the rope; push hard upon the door! — I stubbed my toe upon an old tree stump. — He wore old shoes upon his feet. — Born upon the 4th of July. — I have no opinion upon this subject. — They proceeded to arrest someone upon suspicion of bribery. — Upon Jack's entry, William got up to leave. — Before we knew it, the forest was upon us, and the air grew colder and damper. — What will be the effect upon morale? — Have pity or compassion upon him. — They lived upon ten dollars a week. — We ate heaps upon heaps of food. — I depended upon them for assistance. — He affirmed or promised upon his word. — Upon my life, I am innocent. — A curse upon him!
- Yesterday, upon the stair / I met a man who wasn’t there / He wasn’t there again today / I wish, I wish he’d go away …
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。