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Trọng âm từ – Word stress – yếu tố vô cùng quan trọng khi nói tiếng Anh

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Word stress is your magic key to understanding spoken English. Native speakers of English use word stress naturally. Word stress is so natural for them that they don’t even know they use it. Non-native speakers who speak English to native speakers without using word stress, encounter two problems:

  1. They find it difficult to understand native speakers, especially those speaking fast.
  2. The native speakers may find it difficult to understand them.

See more below:

Why is Word Stress Important?

Word stress is not used in all languages. Some languages, Japanese or French for example, pronounce each syllable with eq-ual em-pha-sis.

Other languages, English for example, use word stress.

Word stress is not an optional extra that you can add to the English language if you want. It is part of the language! English speakers use word stress to communicate rapidly and accurately, even in difficult conditions. If, for example, you do not hear a word clearly, you can still understand the word because of the position of the stress.

Think again about the two words photograph and photographer. Now imagine that you are speaking to somebody by telephone over a very bad line. You cannot hear clearly. In fact, you hear only the first two syllables of one of these words, photo…Which word is it, photograph or photographer? Of course, with word stress you will know immediately which word it is because in reality you will hear either PHOto… orphoTO… So without hearing the whole word, you probably know what the word is (PHOto…graph or phoTO…grapher). It’s magic! (Of course, you also have the ‘context’ of your conversation to help you.)

This is a simple example of how word stress helps us understand English. There are many, many other examples, because we use word stress all the time, without thinking about it.


What is Word Stress?

In English, we do not say each syllable with the same force or strength. In one word, we accentuate ONE syllable. We say one syllable very loudly (big, strong, important) and all the other syllables very quietly.

Let’s take 3 words: photographphotographer and photographic. Do they sound the same when spoken? No. Because we accentuate (stress) ONE syllable in each word. And it is not always the same syllable. So the shape of each word is different.

click word to hear shape total

This happens in ALL words with 2 or more syllables: TEACHer, JaPAN, CHINa, aBOVE, converSAtion, INteresting, imPORtant, deMAND, etCETera, etCETera, etCETera

The syllables that are not stressed are weak or small or quiet. Native speakers of English listen for the STRESSED syllables, not the weak syllables. If you use word stress in your speech, you will instantly and automatically improve your pronunciationand your comprehension.

Try to hear the stress in individual words each time you listen to English – on the radio, or in films for example. Your first step is to HEAR and recognise it. After that, you can USE it!

There are two very important rules about word stress:

  1. One word, one stress.(One word cannot have two stresses. So if you hear two stresses, you have heard two words, not one word.)
  2. The stress is always on a vowel.


Understanding Syllables

To understand word stress, it helps to understand syllables.
Every word is made from syllables.
Each word has one, two, three or more syllables.

word number of syllables
dog dog 1
green green 1
quite quite 1
quiet qui-et 2
orange or-ange 2
table ta-ble 2
expensive ex-pen-sive 3
interesting in-ter-est-ing 4
unrealistic un-rea-lis-tic 4
unexceptional un-ex-cep-tio-nal 5

Notice that (with a few rare exceptions) every syllable contains at least one vowel (a, e, i, o or u) or vowel sound.


Where do I Put Word Stress?

There are some rules about which syllable to stress. But…the rules are rather complicated! Probably the best way to learn is from experience. Listen carefully to spoken English and try to develop a feeling for the “music” of the language.

When you learn a new word, you should also learn its stress pattern. If you keep a vocabulary book, make a note to show which syllable is stressed. If you do not know, you can look in a dictionary. All dictionaries give the phonetic spelling of a word. This is where they show which syllable is stressed, usually with an apostrophe (‘) justbefore or just after the stressed syllable. (The notes at the front of the dictionary will explain the system used.) Look at (and listen to) this example for the wordplastic. There are 2 syllables. Syllable #1 is stressed.

example phonetic spelling:
dictionary A
phonetic spelling:
dictionary B
/plæs’tIk/ /’plæs tIk/


Rules of Word Stress in English

There are two very simple rules about word stress:

  1. One word has only one stress.(One word cannot have two stresses. If you hear two stresses, you hear two words. Two stresses cannot be one word. It is true that there can be a “secondary” stress in some words. But a secondary stress is much smaller than the main [primary] stress, and is only used in long words.)
  2. We can only stress vowels, not consonants.

Here are some more, rather complicated, rules that can help you understand where to put the stress. But do not rely on them too much, because there are many exceptions. It is better to try to “feel” the music of the language and to add the stress naturally.

1 Stress on first syllable

rule example
Most 2-syllable nouns PRESent, EXport, CHIna, TAble
Most 2-syllable adjectives PRESent, SLENder, CLEVer, HAPpy

2 Stress on last syllable

rule example
Most 2-syllable verbs to preSENT, to exPORT, to deCIDE, to beGIN

There are many two-syllable words in English whose meaning and class change with a change in stress. The word present, for example is a two-syllable word. If we stress the first syllable, it is a noun (gift) or an adjective (opposite of absent). But if we stress the second syllable, it becomes a verb (to offer). More examples: the words exportimportcontract and object can all be nouns or verbs depending on whether the stress is on the first or second syllable.

3 Stress on penultimate syllable (penultimate = second from end)

rule example
Words ending in -ic GRAPHic, geoGRAPHic, geoLOGic
Words ending in -sion and -tion teleVIsion, reveLAtion

For a few words, native English speakers don’t always “agree” on where to put the stress. For example, some people say teleVIsion and others say TELevision. Another example is: CONtroversy and conTROversy.

4 Stress on ante-penultimate syllable (ante-penultimate = third from end)

rule example
Words ending in -cy-ty-phy and-gy deMOcracy, dependaBIlity, phoTOgraphy, geOLogy
Words ending in -al CRItical, geoLOGical

5 Compound words (words with two parts)

rule example
For compound nouns, the stress is on the first part BLACKbird, GREENhouse
For compound adjectives, the stress is on thesecond part bad-TEMpered, old-FASHioned
For compound verbs, the stress is on the secondpart to underSTAND, to overFLOW

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