Grade 8English

Pollution

Listening comprehension; primary auxiliaries; intensive reading; functional writing.

📖 4 min read · 3 worked examples · 7 practice questions

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The lesson

This slide shows our learning goals for today: we'll explore the unit theme, the key language skills we'll practice, and look at real Kenyan examples. First, the theme – G8 Theme 3, Pollution. We'll examine how waste ends up in the Nairobi River, why air quality in Nairobi matters, and the plastic litter problem in Mombasa. Along the way, we'll develop listening comprehension, work with primary auxiliaries, practice intensive reading, and produce functional writing pieces like reports and letters. If anything feels unclear, just raise your hand. We'll pause often to check understanding and make sure everyone is comfortable with the material.

Let's turn to today's listening task, Voices of Kenya, which will let us hear directly from a Nairobi resident about river pollution. First, we need to be comfortable with a few key words you'll hear in the audio: waste—unwanted material, smog—polluted air, and runoff—water that carries contaminants away from the land. Take a quick look at those terms on the slide; you'll hear each of them in the interview. While you listen, keep these questions in mind: What are the main sources of pollution mentioned? How does the resident describe the impact on the community? What solutions does she suggest? Press play and listen to the two‑minute interview. Focus on those key words and the questions we just highlighted.

Today we're focusing on primary auxiliaries—those little helper verbs that let us talk about ability, possibility, permission, obligation, and the future. The title here, "Grammar Focus: Primary Auxiliaries," tells us exactly what we'll explore. These bullet points list the main functions: expressing ability, possibility, permission, and obligation. For example, "can" shows ability, while "must" indicates obligation. Notice how each auxiliary is followed by the base form of a verb—that's the structure we always use. A Kenyan context example: "We must keep the river clean." Here, "must" expresses a strong obligation to protect our environment. To recap, primary auxiliaries help us talk about what we can do, what might happen, what we're allowed to do, and what we have to do, always placed before a base verb. Any questions before we move on?

Everyone, let's dive into our intensive reading on plastic pollution. First, we'll identify the main idea and the supporting details. At the bolded sentences – they usually carry the central message. Next, notice the table showing how much plastic waste was collected in Mombasa in 2023. These numbers help us understand the scale of the problem. Finally, we'll highlight key vocabulary such as "microplastics" and "landfill." Knowing these terms will make the comprehension questions easier. If anyone has a question about any of these points, feel free to raise your hand now.

Class, today we're going to create a persuasive poster about pollution. This kind of writing is called functional writing because it has a clear purpose—in this case, to raise awareness and inspire action. First, let's look at our target audience. As the slide shows, we're writing for our fellow students. That means we should use language that's relatable and keep the message short and impactful. Next, we need to use primary auxiliaries like 'should', 'must', and 'have to' to give advice and express obligation. For example, 'We must reduce plastic waste'. Finally, remember the structure: a catchy headline, the main message, and a clear call‑to‑action. This will guide the reader through the poster smoothly.

Worked examples

– Ability

Let's dive into Worked Example 1, focusing on the ability auxiliaries "can" and "could" when we talk about preventing pollution. First, notice the positive sentence: "Kids can recycle plastic bottles." Here, "can" shows a real ability that we already have. At the negative example: "We could not ignore the smog." "Could not" expresses an ability that was impossible—or at least not permitted—in that situation. Finally, here's a quick transformation exercise. Fill in the blanks: "______ can / could ______." Try making one positive and one negative sentence about something in your community.

– Obligation

All right, let's dive into Worked Example 2 on obligation. We'll see how we use 'must' for strong advice and 'should' for suggestions. First, notice the positive statement: "We must reduce waste." The word must tells us this is an urgent, non‑negotiable requirement. At the suggestion line: "You should plant trees." Here should offers a recommendation—strong, but not compulsory. Finally, let's rewrite this short paragraph using auxiliaries. For example, 'We must recycle plastic, and you should join the school's clean‑up club.' Great job! Remember, must signals a must‑do action, while should gives helpful advice. Any questions before we move on?

– Possibility

Let's work through Example 3, which focuses on using 'may', 'might', and 'could' to talk about possible future pollution outcomes. First, notice the sentence: Air quality may improve if factories use cleaner fuel. The word 'may' shows a realistic possibility. Next, consider: The river might flood if garbage blocks drainage. Here 'might' indicates a slightly less certain outcome. Finally, we'll practice building our own sentences using 'may', 'might', and 'could'. Pair up and create a short scenario about how daily choices could affect our environment. Remember, 'may' suggests a likely possibility, 'might' a less certain one, and 'could' opens up many options. We'll share a few examples together in a moment.

Practice questions

  • For the first question, think about the timing. "She ____ finished her homework before dinner" refers to a completed action in the past that happened before another past event, so the correct auxiliary is *had*.
  • The second question asks for a polite invitation. In English we often use *Would* to make a courteous offer: "Would you like to join the school choir?
  • The short‑answer passage is about how new borehole projects in Kenyan villages are improving access to clean water, which frees up children's time for school. The main point is that clean‑water projects boost both health and education.
  • Finally, the fourth sentence is about something that is likely to happen soon. We use *might* to express a reasonable possibility: "They might be arriving soon.
  • Your task is simple: write ONE clear sentence for your poster that includes at least one auxiliary verb. Think about the message you want your poster to convey and choose an auxiliary that fits naturally.
  • A few common slip‑ups to watch out for: don't forget to include the auxiliary—just a noun phrase isn't enough. Also, keep the sentence concise enough to fit on a poster while still sounding complete.
  • Take a moment, draft your sentence, and when you're ready, hit submit.

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