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选择性必修二《Unit 3 Food and Culture》Discovering useful structures优秀ppt课件
Period 3 Discovering useful structures
Unit 3 Food and Culture
The past perfect tense and its passive voice
The Past Perfect Passive
By the time the tornado ended, more than 700 people had been killed.到龙卷风结束时，已有700多人丧生。
Q: Which event happened first?
the tornado ending
700 people dying
past
had been killed
A past event before another past event
/a past time
when/before/after/by…
now
active
passive
The room looked nice. Somebody had cleaned it.
The room looked nice.
It had been cleaned.