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译林2003课标版《Grammar and usage(1)： The passive voice；Modal verbs and the passive voice》精品PPT课件优质课下载
“ Good husband”.
is called
The pet dog ________________(treat) by a
Veterinarian(兽医）.
is being treated
Grammar and usage
The passive voice
A frog __________ ( catch) by a big bird just now.
was caught
The lovely robots attract the visitors.
The visitors are attracted by the lovely robots.
active voice
passive voice
How can we change a sentence into the passive voice?
____________
_____________________
________
________________
Tense
The active voice
The passive voice
The simple present
The present continuous
The present perfect
do / does