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《Grammar and usage(1)： The passive voice；Modal verbs and the passive voice》集体备课PPT课件优质课下载
The pet dog ________________(treat) by veterinary.
is being treated
A frog __________ ( catch) by a big bird just now.
was caught
am/is/are
一般现在时
am/is/are+being
现在进行时
shall/will+be
一般将来时
have/has+been
现在完成时
+ done
+ done
was/were
一般过去时
was/were+being
过去进行时
would+be
过去将来时
had+been
过去完成时
How can we change a sentence into the 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.