Shadowing Practice: Lighthouse Lab – Floating and Sinking - Learn English Speaking with Video

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The Lighthouse Lab I'm going to go ahead and put it in the middle of the middle.
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Thank you.
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Oh, hey there.
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If you've ever taken a bath before, you'll have noticed that some things Like this rubber duck, Stay on top of the water.
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They float.
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Other things, like this bath plug, sink to the bottom of the bath.
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They sink in water. So what causes this?
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Well, the simple answer has to do with density.
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Density is the amount of mass an object has in a given volume.
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The more mass an object has in a given volume, the more dense it is.
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Objects that are more dense than water will sink to the bottom.
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But objects that are less dense than water will float on the top.
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Our rubber duckies volume is mostly made up of air which is less dense than water.
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That's why it floats on top.
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Take a look at these objects.
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Let's make predictions about which ones will float or sink when placed in this bath of water.
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Thank you.
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This is a ball of modelling clay.
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Hmm, it feels pretty heavy.
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I think it might sink.
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What do you think?
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Yep.
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It's definitely more dense than water.
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Thank you.
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What about this metal coin?
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Metal is pretty heavy.
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I think this is definitely going to sink in water.
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Yep.
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Definitely more dense than water.
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This polystyrene ball is very light.
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I think this is definitely less dense than the water.
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What do you think?
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Yep.
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It floats.
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What about this ping pong ball?
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It feels very light too.
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I think it's less dense than water.
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Yep.
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It floats.
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What about this glass marble?
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Hmm.
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Yep, definitely more dense than the water.
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This is a wooden block.
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Hmm.
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I'm not sure about this one.
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What do you think?
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Wow, it floats.
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So the wooden block is less dense than water.
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That was fun, wasn't it, rubber ducky?
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What's that?
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You want to go for another swim?
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Here you go.
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See you next time in the Lighthouse Lab.
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Music.
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Vocabulary and speaking notes for this lesson

This video has 54 sentences and 348 words to shadow. The speech runs for 3:17. The speaker talks slowly, about 106 words per minute, so there is time to copy every sound. Only 79% of the words are among the 3,000 most common in English, so the vocabulary is demanding.

Key vocabulary in this video

15 less common words from the video, with pronunciation and meaning:

  • dense /ˈdɛns/ (adjective) — Having relatively high density.
  • float /fləʊt/ (verb) — To be supported by a fluid of greater density (than the object).
  • sink /ˈsɪŋk/ (verb) — To descend or submerge (or to cause to do so) into a liquid or similar substance.
  • bath /bɑːθ/ (noun) — A tub or pool which is used for bathing: bathtub.
  • rubber /ˈɹʌbɚ/ (noun) — Pliable material derived from the sap of the rubber tree; a hydrocarbon biopolymer of isoprene.
  • density /ˈdɛn.sə.ti/ (noun) — A measure of the mass of matter contained by a unit volume.
  • wooden /ˈwʊdn̩/ (adjective) — Made of wood.
  • painful /ˈpeɪn.fl̩/ (adjective) — Causing pain or distress, either physical or mental.
  • clay /kleɪ/ (noun) — A mineral substance made up of small crystals of silica and alumina, that is ductile when moist; the material of pre-fired ceramics.
  • duck /dʌk/ (noun) — Any of certain aquatic birds of the family Anatidae, having a flat bill and webbed feet, distinguished from swans and geese by generally being smaller and…
  • swim /swɪm/ (verb) — To move through the water, without touching the bottom; to propel oneself in water by natural means.
  • coin /ˈkoɪ̯n/ (noun) — A piece of currency, usually metallic and in the shape of a disc, but sometimes polygonal, or with a hole in the middle.
  • plug /plʌɡ/ (noun) — A pronged connecting device which fits into a mating socket, especially an electrical one.
  • marble /ˈmɑɹ.bəl/ (noun) — A metamorphic rock of crystalline limestone.
  • prediction /pɹɪˈdɪkʃən/ (noun) — A statement of what will happen in the future.

Phrasal verbs you will hear

  • do with (verb) — Only used in to do with
  • go ahead /ˌɡoʊ əˈhɛd/ (verb) — To proceed with; to begin.
  • go for (verb) — To try for, to attempt to reach.
  • look at (verb) — To observe or watch.
  • stay on (verb) — to continue in a place or situation, while others leave.

Pronunciation to watch

The speaker uses 5 contractions and reduced forms, such as I'm, wasn't, you'll. Say them the short way, as you hear them.

How to practise with this video

  1. Listen to the whole video once without speaking and note the words you do not know.
  2. Shadow it sentence by sentence at normal speed, repeating each one until your rhythm matches the speaker.
  3. Record yourself and compare with the original, paying attention to words like dense, float, sink.

Grammar in this video

The structures the speaker uses most, with the exact words from the video:

StructureIn the video
Comparatives -er than / more … than — comparing two thingsmore dense than · less dense than
Future with “will” will + verb — a decision, promise or predictionyou'll have · will sink · will float
Future with “going to” be going to + verb — a plan or something you can see comingI'm going to go · is definitely going to sink

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.

Shadowing technique: read the full step-by-step guide →