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1·What's your extension number?

你的分机号码是多少？《牛津词典》

2·His extension number is 285.

他的分机号码是285。

3·May I have the extension number?

能给我分机号码吗？

4·Its extension number is 285.

它的分机号码是285。

5·I don't know his extension number.

我不知道他的分机号。

6·Can you write down my extension number?

你能记一下我的分机号吗？

7·W: What's the extension number for my phone?

W：我的分机号码是多少？

8·What's the extension number for my phone?

我的分机号码是多少？

9·Can you give me his office extension number?

你能不能把他办公室分机号码告诉我？

10·O: Do you know his extension number or his first name?

你知道他的分机号码和名字吗？