See the theoretical part first…
1. WHO SAID THAT?
key （这）是谁说的？ <(Zhè) shì shéi shuō de?>
A BOSS 老板 <lǎobǎn>
key （这）是你的老板说的。 <(Zhè) shì nǐ de lǎobǎn shuō de.>
3. WHERE WERE YOU BORN?
key
4. I WAS BORN IN SHANGHAI.
key 我是在上海出生的。 <Wǒ shì zài Shànghǎi chūshēng de.>
5. HAVE YOU BEEN TO CHINA?
key We ask whether some event even happened, no place for this structure here. 你去过中国吗？ <Nǐ qùguo Zhōngguó ma?>
6. WHERE DID YOU BUY THIS?
key 这是（你）在哪里买的？ <Zhè shì (nǐ) zài nǎli mǎi de?>
7. I BOUGHT IT IN HONGKONG.
HONGKONG 香港 <Xiānggǎng>
key 这是在香港买的。 <Zhè shì zài Xiānggǎng mǎi de.>