it做形式宾语，真正的宾语是that从句
强调句
强调why
Why was it that he was punished by his teacher?
原句：
Why was he punished by his teacher?
it was why that he was punished...
Why was it that he was punished...?
强调疑问词，就是这样的结构
The smell of roast goose is in the street.
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