Shadowing Practice: How do stem cells work in the body? - Learn English Speaking with Video
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Vocabulary and speaking notes for this lesson
This C1 speaking lesson is built on the video “How do stem cells work in the body?”. The speaker keeps coming back to these words: cell, stem, tissue, marrow, bone. This video has 16 sentences and 284 words to shadow. The speech runs for 2:02. The speaker talks at a steady 140 words per minute, a comfortable pace for shadowing. Only 73% of the words are among the 3,000 most common in English, so the vocabulary is demanding.
Key vocabulary in this video
The 15 most advanced words in the video, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| marrow noun | /ˈmæɹəʊ/ | The substance inside bones which produces blood cells. |
| circulate verb | /ˈsɝ.kjʊˌleɪt/ | To move in circles or through a circuit. |
| migrate verb | /maɪˈɡɹeɪt/ | To relocate periodically from one region to another, usually according to the seasons. |
| renewal noun | The act of renewing. | |
| optimal adjective | /ˈɑptɪməl/ | The best, most favourable or desirable, especially under some restriction. |
| circulation noun | /ˌsɝkjʊˈleɪʃən/ | The act of moving in a circle, or in a course which brings the moving body to the place where its motion began. |
| amplification noun | /ˌæmplɪfɪˈkeɪʃən/ | The act, or result of amplifying, enlarging, extending or adding. |
| bloodstream noun | /ˈblʌd.stɹɪim/ | The flow of blood through the circulatory system of an animal |
| injure verb | /ˈɪn.d͡ʒɚ/ | To wound or cause physical harm to a living creature. |
| multiply verb | /ˈmʌltɪplaɪ/ | To increase the amount, degree or number of (something). |
| stromal adjective | /ˈstɹəʊ̯.məl/ | Of or relating to a stroma. |
| derive verb | /dɪˈɹaɪv/ | To obtain or receive (something) from something else. |
| messenger noun | /ˈmɛs.ən.d͡ʒɚ/ | One who brings messages. |
| extract noun | /ˈɛkstɹækt/ | Something that is extracted or drawn out. |
| thereby adverb | /ðɛɹˈbaɪ/ | By it; by that; by that means, or as a consequence of that. |
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 | being secreted · have been documented |
| Present perfect have/has + past participle — a past action that still matters now | have been documented |
| Relative clauses who / which + clause — extra information about a person or thing | cells, which are |
Pronunciation to watch
- The “sh” and “zh” sounds: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/
- Long words — get the stress right: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Shadow it sentence by sentence at normal speed, repeating each one until your rhythm matches the speaker.
- Record yourself and compare with the original, paying attention to words like marrow, circulate, migrate.
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.