Here are some of the key differences between Mandarin Chinese and Cantonese:

Pronunciation: Mandarin and Cantonese are both tonal languages, but they have different numbers of tones. Mandarin has four tones, while Cantonese has six tones.
Vocabulary: Mandarin and Cantonese have different vocabularies. There are some words that are shared between the two languages, but there are also many words that are unique to each language.
Grammar: Mandarin and Cantonese have different grammars. For example, the word order is different in the two languages.
Writing: Mandarin and Cantonese are written using different writing systems. Mandarin is written using simplified Chinese characters, while Cantonese is written using traditional Chinese characters.
It is important to note that Mandarin and Cantonese are not mutually intelligible. This means that a speaker of Mandarin will not be able to understand a speaker of Cantonese, and vice versa.

Despite their differences, Mandarin and Cantonese are both Chinese languages. They share a common history and culture, and they are both spoken by millions of people around the world.
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