Bài giảng Chuyên đề ngữ pháp tiếng Anh - Ôn tập: Passive Voice

 Passive Voice
 Chapter 11
Wind Energy Don’t use a by-phrase when the person who did the 
action is not known or is not important.
The first windmills were developed in Persia
 in 500-900 A.D. by people.
 Who exactly developed People, but we don’t 
 the windmills? know who exactly.
 Is it important to know No.
 who? Use the by-phrase for important interesting 
information. 
And in the late nineteenth century, windmills 
were used by scientists to generate electricity.
 Who used the windmills? Scientists.
 Is it important or YES, so use the by-phrase.
 interesting to know who? Practice 1
Complete the sentences with the verbs in parentheses. 
Some sentences are Passive, and some are Active.
 5.The use of windmills (decline) _______________declined in 
 Europe in the nineteenth century when the steam 
 engine (invent) _________________.was invented
 6. In the western United States, windmills (use) 
 _________________were used by cowboys and farmers to 
 provide water for their horses and cattle. In the 20th century, electricity was mainly generated from 
fossil fuels, such as oil and coal. However, because of the high 
cost of fossil fuels, research into wind power and other forms of 
renewable energy* was continued. Today many windmills are 
located in Spain. In fact, the remote hills of Spain are dotted
with tall, graceful windmills. Nuclear power and coal have been 
replaced as the country’s most efficient source of energy. By 
2010, thirty percent of the electricity in Spain will come from 
renewable energy. Currently, the Navarra region of Spain 
generates seventy percent of its electricity from renewable 
energy sources, and one hundred percent will soon be
provided. By 2010, wind could be used to supply half of the 
energy supplied by renewable energy. Could or should wind 
power and other renewable energies be developed more 
extensively in other countries? What do you think? 
*Renewable energy is energy that gets replenished by natural sources Use the passive form of a modal to express a 
possibility or advisability.
 Possibility (could) and Advisability (should)
 Could or should wind power and other 
 renewable energies be developed more 
 extensively in other countries?
 Is it possible to develop wind power and other 
 renewable energies in other countries?
 Is it a good idea to develop wind power and 
 other renewable energies in other countries? Use a non-progressive passive when the 
past participle functions as an adjective.
 The remote hills of Spain are dotted with 
 tall, graceful windmills. Practice 2 
Complete the sentences with a passive form of the 
given verb.
1.Fossil fuels (located) ________________are located in the 
 ground. Renewable fuels (can,find) __________can be 
 ___________found in many different places.
2. The government said that wind mills (build) 
 ___________________are going to be built along the coast over the 
 next two years.
3. As wind power becomes more popular, some hills 
 in Spain (be, cover) _________________are being covered with 
 windmills. REVIEW
Change the active sentences to passive.
 1. A hundred years ago, most people heated their 
 homes with wood or coal.
 A hundred years ago, most homes were heated 
 with wood or coal.
 2. Today more and more people are using 
 renewable energy sources such as wind or solar.
 Today renewable energy sources such as wind 
 or solar are being used by more and more 
 people. CREDITS
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