See the theoretical part first…

1. WHO SAID THAT?

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（这）是谁说的？

<(Zhè) shì shéi shuō de?>  [/expand]

A BOSS 老板  <lǎobǎn>

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（这）是你的老板说的。

<(Zhè) shì nǐ de lǎobǎn shuō de.> [/expand]

3. WHERE WERE YOU BORN?

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 [/expand]

4. I WAS BORN IN SHANGHAI.

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我是在上海出生的。

<Wǒ shì zài Shànghǎi chūshēng de.> [/expand]

5. HAVE YOU BEEN TO CHINA?

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We ask whether some event even happened, no place for this structure here.

你去过中国吗？

<Nǐ qùguo Zhōngguó ma?> [/expand]

6. WHERE DID YOU BUY THIS?

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这是（你）在哪里买的？

<Zhè shì (nǐ) zài nǎli mǎi de?> [/expand]

7. I BOUGHT IT IN HONGKONG.

HONGKONG 香港 <Xiānggǎng>

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这是在香港买的。

<Zhè shì zài Xiānggǎng mǎi de.> [/expand]