What are the three countries that use Mandarin as there language?

While Mandarin is the most widely spoken language in the world, there are only two countries that use Mandarin as their official language:

1. China: The People's Republic of China uses Mandarin as its official language. This includes both Standard Mandarin, which is the standard dialect, and various regional dialects.

2. Taiwan: The Republic of China (Taiwan) also uses Mandarin as its official language.

It's important to note that:

* Singapore: While Mandarin is one of four official languages in Singapore, it is not the primary language. English holds that distinction.

* Malaysia: Mandarin is spoken by a significant portion of the Chinese community in Malaysia, but it is not an official language.

Therefore, the two countries that use Mandarin as their official language are China and Taiwan.