Vocabulary
Look out!
We add -er, -or or -ist to a verb or noun to form a noun indicating people.
Example:
to learn → learner
to invent → inventor
science → scientist
1. Complete the following sentences with nouns indicating people.
1. A person who give advice is an adviser/ advisor.
2. A scientist who studies chemistry is a chemist.
3. A person whose job is to design things is a designer.
4. A person whose job is writting programmes for computers is a programmer.
5. A marine biologist is a scientist who studies life in the sea.
2. Write a noun from the list under each picture.
| doctor archaeologist software developer | chemist explorer | physicist engineer conservationist |
3. Give the correct form of the words in brackets.
1. Every day we hear about new (develop) __________ in science and technology.
2. Einstein was one of the greatest (science) __________ in the world.
3. The USA is a world leader in space (explore) __________.
4. Advances in (medicine) __________ science will help people live longer in the future.
5. There is a link between (economy) __________ development and the environment.
Pronunciation
Stress in words starting with un- and im-
When we add the prefix un- or im- (meaning ‘not’) to a root word, the stress of the word does not normally change.
Example:
‘friendly → un‘friendly
‘probable → im‘probable
Note: When we add the prefix un- or im- to a one-syllable word, the stress falls on the root word.
Example:
fair → un’fair
pure → im’pure
4. Listen and repeat the following words. Mark the stressed syllables in the words.
| unforeseen immature impatient impure impossible unnatural | unlucky unwise unhealthy unhurt unlimited impolite |
5. Put the words from 4 in the right columns.
| oO | oOo | ooO | oOoo |
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6. Fill the gaps with one of the words in 5. Listen and check, then read the sentences.
1. The teacher said this water was __________ and couldn't be used in our experiment.
2. Scientists have identified a link between an __________ diet and diseases.
3. This job would be __________ without the help of a computer.
4. Our natural resources are not __________.
5. It's no good being __________ with small children.
