"That person is our doctor."

Translation: 那个人是我们的医生。

[sahar-rabayev]

why is it wrong not to add the second word in this sentence since you can say "that" without it?

[Kim765719]

If you are referring to the "ge", I think in Chinese you must have that word when you refer to a person. I believe it is a required "measure" word, like "a" or "an" in English, though in this case we wouldn't use those words in English.

[JulieRowle]

Isn't it rude to use the measure word ``ge'' for people? Wouldn't wei 位 be more polite?

[Cinnamon5230]

Although "位" is more polite, "个" is usually not considered rude.
However, "个" cannot replace "位" in common phrases like "诸位".

[Glycoprotein]

Precisely, 个 is prominently used in everyday speaking language. Being polite and formal would mean that you would use 位.

[HNgcChuchu]

Very interesting for me. I love Chinese language

[OoO51]

How about "那位是我们的医生"？

[Glycoprotein]

You can't say that. You're literally saying "That an is our doctor."
In Chinese, measure words are the equivalent of "a" and "an", which signify the amount, category, or the type of the "subject" or "thing." i.e. "A teacher. 一位老师."
In Chinese, just remember that measure words always come before the thing itself. The correct phrase is 那位人是我们的医生."

[VaishnoGum]

Isn't this correct