Confusing words

Hi guys❗ I'm sure that you have ever heard these words, which sometimes are confused.

Do you know what the difference between them is❓ If you don't know it, read the following❸conversations and try to guess. Good luck 🍀❗

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Teacher: Please, open your 📚 on page 14 and read the text.

💬
Frank: Would you like a piece of 🍰❓
Katty: No, thanks. I'm on a diet.

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Girl: Mummy, could you tell me that story, please❓

Mum: Okay. Once upon a , a girl who wore a green hook...

Did you guess the difference between these prepositions❓ Well; if you are 😕, don´t 😟 don´t 😢. Let´s see their uses 😉.

On
This word has many and different meanings.
On can mean in or into a position covering, touching or forming part on a surface.
      There's a beautiful painting on the wall.
                                                    ↳ on the wall
      Oh no! There's a coffee mark on the book cover.
              ↳ on the book cover
      Please, open your books on page 14 and read the text.
              ↳ on page + number
We say this preposition when talking about means of transport.
      Kevin usually comes to work on his bike.
                      ↳ on bike/bus/etc.
Also, on is used to give directions and 📞 numbers.
    The cafe's next the library, actually, it's on the left.
                            ↳ on left/right
    You can get them on 010 0001 1011
                        ↳ on + telephone number
👨👩 use it to show a day or date.
    Andrew came on Monday to celebrate Christmas.
                              ↳ on Monday
    He gives me a book as a present on my last birthday.
   ↳ on (sb's) birthday/aniversary/etc.
On is a synonym of 'immediately after'.
      I was so exhausted that on arriving home I hit the sack.
                            ↳ on sth/doing sth
Additionally, on means about something or 👨/👩.
      I love that book basic on Peruvian myths.
                                           ↳ basic on sth
      The teacher tested us on conditionals.
                                           ↳ test on sth
This preposition is also used to refer to eating/drinking something or using a drug/medicine regularly.
      I'm on a diet.
             ↳ on a diet
      The doctor put him on antibiotics.
                                        ↳ on antibiotics
👨👩 say on to mean by kinds of something or using something.
      The info is available on the Internet.
                                        ↳ on the Internet
      They used to speak on the phone hours and hours.

                                              ↳ on the phone
      What's on TV?
                     ↳ on TV/channel + number
Another meaning of on is paid for by 👨/👩.
      The 🍕🍕🍕 are on me.
                                    ↳ on sb
Moreover, we use this word for describing an activity or state.
      Are you on holidays?
                     ↳ on holidays

Upon
Upon has the same meaning as on but it is usually used in more formal context or in phrases like 'once upon a time'.
     Once upon a time, a girl who wore a green hook...
       ↳ once upon a time
This word also emphasize that there are a large number or amount of something.
     When Rose's father was abroad, he sent her mother hundreds upon hundreds of emails.
             ↳ (hundres/thousands/etc.) upon (hundres/thousands/etc.) of sth

Thanks for reading this post. I hope that everyone can understand this lesson 😀.

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Have a nice day❗