Shadowing Practice: Seminar Presentation: How Vaccines Train Your Immune System - Learn English Speaking with Video

Right, let's begin. Priya, the floor is yours.

Thanks. Um, I'm a bit nervous, so bear with me.

Today I'm going to explain how vaccines actually work.

So, have you ever done a fire drill at school?

Ha, loads of times. Usually in the rain.

Exactly! Nobody's in danger, but everyone practises.

Well, a vaccine is basically a fire drill for your body!

Every germ carries tiny markers called antigens.

A vaccine shows your body those markers,

using a weakened germ, a dead one, or just a piece of it.

So you get the practice, without the real illness.

And then, your immune system gets to work!

It makes antibodies that stick to the antigens,

and it creates something brilliant: memory cells!

If the real germ turns up later, they recognise it fast.

Your body fights back before you even feel ill!

Sorry, can I ask something?

Of course, go ahead.

If memory cells last, why do we need boosters?

Honestly, why do I need a flu jab every single year?

Hmm... good question. Let me think.

Well, for some vaccines, the memory slowly fades.

A booster is just a reminder for your immune system.

And flu viruses change their antigens all the time.

So last year's practice doesn't match this year's flu.

Oh, that actually makes sense!

One last point: herd immunity.

When most people are protected, the germ can't spread easily.

That protects newborn babies, and people who can't have vaccines.

So, that's it! Thank you for listening.

Excellent, Priya! The fire drill idea worked really well.

Just slow down a little at the start.

Oh, thank you! Honestly, I was terrified.

You didn't look it. Well done!

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Vocabulary and speaking notes for this lesson

This B2 speaking lesson is built on the video “Seminar Presentation: How Vaccines Train Your Immune System”. The speaker keeps coming back to these words: vaccine, germ, antigens, flu, drill. This video has 34 sentences and 280 words to shadow. The speech runs for 2:08. The speaker talks at a steady 131 words per minute, a comfortable pace for shadowing. Only 76% 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
vaccine noun	/vækˈsin/	A substance given to stimulate a body's production of antibodies and provide immunity against a disease without causing the disease itself in the treatment…
germ noun	/d͡ʒɝm/	The embryo of a seed, especially of a seed used as a cereal or grain. See Wikipedia article on cereal germ.
antigen noun		A substance that induces an immune response, usually foreign (nonself) but not always so.
drill noun	/dɹɪl/	A tool or machine used to remove material so as to create a hole, typically by plunging a rotating cutting bit into a stationary workpiece.
booster noun	/ˈbustɚ/	Something that boosts.
marker noun	/ˈmɑː(ɹ)kə(ɹ)/	A felt-tipped pen, a marker pen.
immune adjective	/ɪˈmjuːn/	Exempt; not subject to.
antibody noun	/ˈæn.tɪˌbɑ.di/	A protein produced by B-lymphocytes that binds to a specific antigen.
terrify verb	/ˈtɛɹɪfaɪ/	To frighten greatly; to fill with terror.
weaken verb	/ˈwikən/	To make weaker or less strong.
practise verb	/ˈpɹæktɪs/	To repeat (an activity) as a way of improving one's skill in that activity.
newborn noun		A recently born baby.
fade verb	/feɪd/	To hit the ball with the shot called a fade.
immunity noun	/ɪˈmjuːnəti/	Protective resistance against disease.
reminder noun	/ɹɪˈmaɪndə(ɹ)/	Someone or something that reminds.

Phrasal verbs you will hear

Word	Pronunciation	Meaning
fight back verb	/faɪt bæk/	To defend oneself by fighting.
go ahead verb	/ˌɡoʊ əˈhɛd/	To proceed with; to begin.
slow down verb		To decelerate.
turn up verb		To show up; to appear suddenly or unexpectedly.

Sentences worth repeating

Short, complete lines from the video that you can reuse in everyday conversation:

Today I'm going to explain how vaccines actually work.
Sorry, can I ask something?
If memory cells last, why do we need boosters?
Honestly, why do I need a flu jab every single year?

Pronunciation to watch

The speaker uses 6 contractions and reduced forms, such as can't, I'm, didn't. Say them the short way, as you hear them.

Long words — get the stress right: antibody /ˈæn.tɪˌbɑ.di/, immunity /ɪˈmjuːnəti/

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 vaccine, germ, antigen.

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 →

Shadowing Practice: Seminar Presentation: How Vaccines Train Your Immune System - Learn English Speaking with Video

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