三．句式点击
1. With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.
with this extra evidence 有了这个额外的证据；with certainty 肯定地，有把握地
在句中作状语，相当于副词.
that 引导宾语从句
polluted 过去分词作定语
2. So many thousands of terrified people died every time there was an outbreak.
terrified 过去分词作定语
every time 短语充当连词作用，还有 the moment/ minute /second; the first / second … last time; immediately/instantly/ directly
eg: The first time I went abroad I could hardly understand what the foreigners said.
The moment I saw him, I knew what had happened.
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