PART IV – GRAMMAR. A. In the ACTIVE VOICE sentences below, write the corresponding number for each verb tense.. 1. Present simple 2. Past simple 3. Present perfect 4. Past participle. B. Do the same to these corresponding PASSIVE VOICE s

PART IV – GRAMMAR

A. In the ACTIVE VOICE sentences below, write the corresponding number for each verb tense.

1. Present simple 2. Past simple 3. Present perfect 4. Past participle

a. We ( ) call this system materials economy.

b. In extraction, people ( ) exploit natural resources.

c. How the system worked ( ) intrigued her.

d. In the 1950, television ( ) exposed people to fewer commercials.

e. In the past three decades, we ( ) have consumed 1/3 of the planet natural resources.

f. People ( ) have tested only some of the chemicals used in industries.

B. Do the same to these corresponding PASSIVE VOICE sentences.

a. This system ( ) is ( ) called materials economy.

b. In extraction, natural resources ( ) are( ) exploited.

c. She ( ) was( ) intrigued by how the system worked.

d. In the 1950s people ( ) were( ) exposed to fewer commercials.

e. In the past three decades, 1/3 of the planet resources ( ) has been( ) consumed.

f. Only some of the chemicals used in industries ( ) have been( ) tested.

Compare the sentences in pairs and try to figure out how passive voice works. Then, change these sentences to passive voice:

1. They chop down trees.

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2. They use up all the water.

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3. They design products to last for a short time.

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4. They have used many chemicals in industry.

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5. Television tells us to buy more and more.

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