Shadowing Practice: How is glass made? - Learn English Speaking with Video
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Hi, it's Doug.
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I recently came across this unbelievable video.
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It was taken at a hotel in Texas where on the roof of the hotel they have this pool
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that hangs off the edge and it has a glass bottom.
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Look at this.
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Would you go in there?
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Would you trust this glass?
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Someone named Benjamin has a question about glass.
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Let's give him a call now.
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Hi, Doug.
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Hi, Benjamin.
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I have a question for you.
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How is glass made?
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That's a great question.
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It's funny, right?
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Think about just how many objects around you are made of glass.
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Without glass, we'd have no windows, no windshields for our cars, no No drinking glasses or eyeglasses.
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No skyscrapers or smartphones.
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And yet, it's really not obvious at all where glass comes from.
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Like if you're sitting there and you have a table or a desk in front of you like this, that's wood.
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I'm guessing you know that wood comes from a tree.
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Or this statue here is carved from stone.
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You know where that comes from. But glass?
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Glass is a material that has to be made.
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How do they make it?
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Where does it come from?
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Before I say anything more, now would be a good time to pause the video and discuss.
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Okay, you ready?
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Well, believe it or not, Glass is made by taking a bunch of sand and getting it so hot that it melts.
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It's one of the most amazing things to watch how it's made because in order to melt sand, you have to use a special type of oven that can get super hot.
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It's called a furnace or a kiln.
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Here you can see someone loading some sand into the furnace.
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Once it gets hot enough, it will melt or become liquid.
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And when you get something this hot, you can see it glows, just like lava.
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This isn't lava though, it's molten sand.
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And as it cools, it will start to look more familiar to you.
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It becomes solid glass.
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To make a flat sheet of glass, like you'd use for a window, they melt sand until it's molten.
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Then they pour it out and roll it into a flat shape like this, and carefully allow it to cool.
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More fancy objects, like a glass vase, are even more fun to watch.
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This involves a special skill called glass blowing.
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You can see here, it starts with this person taking a big glob of molten sand
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and getting it on the end of a hollow pipe.
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Then she blows air into the pipe.
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You can actually blow a bubble into it, which might end up being the open part of the vase.
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The molten glass has a similar thickness as honey.
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They carefully shape it the way they want it and keep turning it and turning it.
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As it cools, it becomes solid.
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Artists can make amazing sculptures with glass.
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Believe it or not, this artist is making a glass swan.
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So that's how glass is made.
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But it's kind of weird, isn't it?
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I mean, how did people ever discover that if you melt sand, it makes glass?
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We've been making glass for a long time.
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So long ago now that no one knows for sure who was the first person to discover
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that if you melt sand it makes glass.
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But some of the earliest objects made of glass come from ancient Egypt, a place covered in desert sand.
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Could it be that someone long ago had a campfire
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and noticed that the heat of their fire melted the sand beneath it?
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No one knows for sure, but it's possible.
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That's all for this week's question.
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Thanks Benjamin for asking it.
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Now for the next episode, there's a lunar eclipse that's going to happen.
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I reached into my question jar and chose three questions about lunar eclipses that I'm thinking about answering.
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When this video is done playing, you'll get to vote on one.
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You can choose from, what's the difference between a solar and lunar eclipse?
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Why does the moon turn blood red during a lunar eclipse?
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Or where does the word eclipse come from?
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So submit your vote when the video's over.
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I wanna hear from all of you watching.
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There are mysteries all around us.
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Stay curious and see you next week.
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Vocabulary and speaking notes for this lesson
This B1 speaking lesson is built on the video “How is glass made?”. The speaker keeps coming back to these words: glass, sand, melt, eclipse, molten. This video has 72 sentences and 728 words to shadow. The speech runs for 4:28. The speaker talks at a natural 163 words per minute, close to everyday conversation. 82% of the words are among the 3,000 most common in English; the rest is worth studying before you start. 14 of its 72 sentences are questions, so it is good practice for question intonation and short answers.
Key vocabulary in this video
The 15 most advanced words in the video, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| melt verb | /mɛlt/ | To change (or to be changed) from a solid state to a liquid state, usually by a gradual heat. |
| eclipse noun | /ɪˈklɪps/ | An alignment of astronomical objects whereby one object comes between the observer (or notional observer) and another object, thus obscuring the latter. |
| lunar adjective | /ˈlunɚ/ | Of, pertaining to, or resembling the Moon (that is, Luna, the Earth's moon). |
| vase noun | /veɪ̯s/ | An upright open container used mainly for displaying fresh, dried, or artificial flowers. |
| furnace noun | /ˈfɝnɪs/ | An industrial heating device, such as for smelting metal or firing ceramics. |
| lava noun | /ˈlɑvə/ | The molten rock ejected by a volcano from a vent such as a crater or fissure; magma that has breached the surface of the earth. |
| pipe noun | /ˈpaɪp/ | A wind instrument consisting of a tube, often lined with holes to allow for adjustment in pitch, sounded by blowing into the tube. |
| campfire noun | /ˈkæmpˌfaɪ̯ɚ/ | A fire at a campground or on a camping trip, often used for cooking, to provide light and heat, to drive away bugs, and as a focal point for sitting around in… |
| eyeglass noun | /ˈaɪˌɡlæs/ | An artificial lens, especially one of a pair. |
| skyscraper noun | /ˈskaɪˌskɹeɪpɚ/ | A very tall building with a large number of floors. |
| windshield noun | /wɪnˈʃiːld/ | A transparent screen made of glass, located at the front and back of a vehicle in front of its occupants to protect them from the wind force generated by the… |
| thickness noun | /ˈθɪknəs/ | The property of being thick (in dimension). |
| swan noun | /swɑn/ | Any of various species of large, long-necked waterfowl, of genus Cygnus (bird family: Anatidae), most of which have white plumage. |
| glow verb | /ɡloʊ/ | To emit heat and light without a flame. |
| sculpture noun | /ˈskʌlpt͡ʃɚ/ | A three-dimensional work of art created by shaping malleable objects and letting them harden or by chipping away pieces from a rock (sculpting). |
Phrasal verbs you will hear
| Word | Meaning |
|---|---|
| come across verb | To change sides; to cross over to work for the opposition. |
| end up verb | To bring to a conclusion. |
| hang off verb | To hold back; to resist moving forward with something despite pressure or intention to do so; to delay, wait or stay behind. |
Sentences worth repeating
Short, complete lines from the video that you can reuse in everyday conversation:
- Would you go in there?
- Would you trust this glass?
- Let's give him a call now.
- We've been making glass for a long time.
Grammar in this video
The structures the speaker uses most, with the exact words from the video:
| Structure | In the video |
|---|---|
| Passive voice be + past participle — the focus is on what happens, not who does it | was taken · are made · is carved |
| Superlatives the -est / the most … — the top or bottom of a group | the most amazing · the earliest |
| Present continuous am/is/are + -ing — something happening right now or around now | you're sitting · I'm guessing · is making |
| Future with “will” will + verb — a decision, promise or prediction | will melt · will start · you'll get |
Pronunciation to watch
The speaker uses 10 contractions and reduced forms, such as I'm, isn't, wanna. Say them the short way, as you hear them.
- The “th” sounds: thickness /ˈθɪknəs/, beneath /bɪˈniːθ/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
- Record yourself and compare with the original, paying attention to words like melt, eclipse, lunar.
What is the Shadowing Technique?
Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.