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必修5《Grammar》PPT课件优质课下载
was written
Mark Twain wrote this book.
What is the man doing?
He is feeding a dog.
= A dog ___________ by him.
is being fed
When shall we use the passive voice?
1.Use the passive voice when you want to emphasize the receiver,rather than the doer of an action.
e.g. William led the invasion.
The invasion was led by William.
2.Use the passive voice when you do not know the doer of an action.
e.g. These books are written for teenagers.
3.Use the passive voice when you want to be polite, or when you do not want to identify the doer of an action.
e.g. You are cordially invited to a party.
Grammar—1. Put the following sentences into passive voice
In the late 1970s students revived the tradition.
Today, people in Venice celebrate carnival for five days in February.
The government will build more roads to solve the problem of traffic jams.
In the late 1970s the tradition was revived by the students.
Today,carnival is celebrated in Venice for five days in February.
一般现在时的被动语态：am/is/are+过去分词
一般过去时的被动语态：was/were+过去分词
一般将来时的被动语态：will be+过去分词
More roads will be built to solve the problem of traffic jams by the government.
4. Wait a moment. My mother is cooking lunch.