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《Grammar and usage(1)： The passive voice；Modal verbs and the passive voice》精品PPT课件优质课下载
A frog __________ (catch) by a big bird just now.
was caught
An argument _____ already __________
__________ (put forward).
has been put forward
Point out the verb, the subject and the object in the following sentences:
We kept food in the fridge.
We must close the windows and the door.
S
V.
O.
S
V.
O
Food was kept (by us) in the fridge.
The windows and the door must be closed.
How can we change a sentence into passive voice ?
1. Find out the object of the sentence and use it as the subject of the sentence with the passive voice.
2. Decide the tense of the sentence and use the related form of its passive.
3. If necessary, use “by” to join the former subject, which should be put into its object form.
When do we use the passive voice?
Many houses will be built here.
不知道或没必要指出动作的执行者。
The song “The East is Red” was written by a poor peasant.
强调动作的承受者。