Изучаем English Unit 30. Unforgettable.
Stress in Longer Words 1
Unit 30; Part A
We can build longer words by adding parts to the beginning or end ofshorter words. Usually, this does nor change the stress: it stays onthe same syllable as in the original word. Look at the example below.
Here is a list of beginnings and endings which do not change the stress of the shorter word:
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Unit 30; Part B
Some endings do change the stress in the shorter word. Look how the ending -ion changes the srress in the word educate. | |
When we add the endings -ion or -ian, the stress always moves to the syllable before these endings. Here are some more examples.  | |
 Note: -tion and -cian are pronounced /∫∂n/. | |
Unit 30; Part C
The ending -ic also moves the stress to the syllable before it. Listen to these examples.
Note: When a syllable changes from unstressed tostressed, or stressed to unstressed, the vowel sound often changes. Forexample the letter O in atom is pronounced /∂/, but in atomic, it is pronounced /o/, the A in atom is pronounced /æ/ but in atomic it is /∂/.Note: The ending -al does not change the stress of the word (see A above), so, for example, the stress is on the same syllable in these two words: economic economical. |
Exercises
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 Write the words from the box in the correct part of the table according to the stress pattern.Key. 
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| Combine each word with one of the endings from the box, and give thestress pattern of your new word. You may need to change or add otherletters to the first word. Use a dictionary to help you if necessary. Key.1 introduction ooOo 2 basic Oo 3 economic ooOo 4 description oOo 5 romantic oOo 6 competition ooOo 7 optimistic ooOo 8 celebration ooOo 9 diplomatic ooOo 10 operation ooOo 11 explanation ooOo 12 decision oOo Example: inform information ooOo
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 | Unit 29 Unit 30 Unit 31 |  |