everyone is much quieter than usual when taking a test为什么用taking?

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everyoneismuchquieterthanusualwhentakingatest为什么用taking?everyoneismuchquieterthanusualwhentakingates

everyone is much quieter than usual when taking a test为什么用taking?
everyone is much quieter than usual when taking a test为什么用taking?

everyone is much quieter than usual when taking a test为什么用taking?
这是从属连词+ 分词 作状语的结构
= when ( they are ) taking a test
再如:
Be careful while crossing the road.
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