Stress is the emphasis placed on a particular syllable in a word. A stressed syllable is pronounced with more energy—it is longer, louder, and higher in pitch than the unstressed syllables. In English, stress is marked with the symbol (`) before the stressed syllable. For example:

• banana (stress on the second syllable)
• `ap ple (stress on the first syllable)
• ex`am ple (stress on the second syllable)

Primary and Secondary Stress

There are two main types of stress in English pronunciation:

Primary stress is the strongest emphasis in a word. It makes the syllable noticeably longer, louder, and higher in pitch.

• example — /ɪɡˈzɑːmpəl/ — primary stress on the second syllable
• organization — /ˌɔːɡənaɪˈzeɪʃən/ — primary stress on the fourth syllable
• humanity — /hjuːˈmænəti/ — primary stress on the second syllable

Secondary stress is a lighter emphasis found on other syllables in longer words. It makes a syllable stand out slightly but not as strongly as primary stress.

• university — /ˌjuːnɪˈvɜːsəti/ — secondary stress on the first syllable, primary on the third

Stress Patterns: Nouns vs. Verbs

An important rule in English is that when a word can function as both a noun and a verb, the noun usually takes stress on the first syllable, while the verb takes stress on the second syllable:

This distinction helps listeners understand whether you are referring to a thing or an action.

Intonation refers to the rise and fall of the voice during speech. It conveys mood, emotion, and attitude. Intonation works alongside stress to give English its "musical" quality and helps speakers express feelings such as surprise, anger, interest, or uncertainty.

Main Patterns of Intonation

1. Rising Intonation (↗) The voice rises toward the end of a sentence. This pattern is commonly used in:

   • Yes/No questions: Are you going to Dar es Salaam?
   • Questions asking for clarification: Have you seen Mwalimu anywhere?
   • Lists: I need books, pen, paper, and eraser.

2. Falling Intonation (↘) The voice falls on the final stressed syllable. This pattern indicates:

   • Statements and commands: Do your homework, please.
   • Wh- questions (who, what, where, when, why, how): What did you buy at the market?
   • Finality or certainty: The meeting ends at five o'clock.

3. Fall-Rise Intonation (˅) The voice falls and then rises. This pattern suggests:

   • Uncertainty or reservation: So, you'd be willing to help? Well... I suppose so.
   • Politeness in requests: Could you pass the salt?
   • Expressing contrast or condition: He has arrived? (implying doubt)

How Intonation Changes Meaning

Intonation can completely change the meaning of a sentence:

• She is the first female president. (statement — falling intonation)

• She is the first female president? (question — rising intonation, expressing surprise)

• How was your trip? (rising intonation — shows genuine interest and curiosity)

• How was your trip. (falling intonation — casual inquiry, no special emphasis)

Stress and intonation are not optional additions to speech—they are fundamental parts of English pronunciation. Here's why they matter:

1. They prevent misunderstanding. Consider the noun-verb stress pairs mentioned earlier. If you say "REcord" when you mean "reCORD," your listener may confusedly picture a disc instead of an action.

2. They express emotion and attitude. A rising intonation on "Really?" shows interest, while a flat tone may suggest boredom. Intonation tells the listener whether you are surprised, angry, excited, or doubtful.

3. They signal sentence type. Intonation helps listeners know if you are making a statement, asking a question, or giving a command. Without the correct intonation, a question can sound like a statement or vice versa.

4. They make speech sound natural. Native speakers use stress and intonation automatically. Using them correctly helps your English sound more fluent and easier to understand.

5. They clarify meaning in context. In a debate or classroom discussion, proper stress on key words draws attention to important ideas. For example, stressing the word "you" in "You should submit the assignment" emphasizes responsibility.

Example 1: Stress in Everyday Conversation

A student meets a friend at the school gate:

• Friend: Did you bring the book?
• Student: Yes, I brought it.

The word "brought" has only one syllable, so it receives primary stress. In response, the student may stress "it" to emphasize the object. If the student said "I brought IT" (with strong stress on "it"), the friend understands that the book is definitely available.

Example 2: Intonation in a Classroom Debate

During a debate about school uniforms, a student says:

• School uniforms should be abolished. (falling intonation — makes a firm statement)

Another student responds:

• School uniforms should be abolished? (rising intonation — expresses surprise or challenges the idea)

The same words, with different intonation, convey completely different attitudes.

Example 3: Stress and Meaning in a Tanzanian Context

A shopkeeper at a local market says:

• "This tomato is fifty shillings per kilo."

If the stress falls on "fifty," the customer understands the price is fixed. If the stress falls on "per kilo," the shopkeeper emphasizes the unit of measurement.

• Listen to English news broadcasts, podcasts, or films and pay attention to how speakers stress words and use intonation.
• Practice reading aloud with correct stress patterns. Use a dictionary to check the syllable stress of unfamiliar words.
• Record yourself speaking and compare it to native speaker recordings.
• In class debates and dramatizations, consciously experiment with different stress and intonation patterns to see how meaning changes.

In everyday life in Tanzania, stress and intonation play a crucial role in market transactions and phone conversations. When negotiating prices at a local market in Arusha or Mwanza, using the correct intonation can prevent misunderstandings—for example, saying "Five thousand" with falling intonation states a firm price, while a rising intonation invites negotiation. Similarly, when receiving a call from a mobile money agent at a shop in Dar es Salaam, hearing the rise or fall in their voice helps you understand whether they are confirming a transaction or asking a question, ensuring you do not send money to the wrong person.