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Which languages are the most useful, or highly recognized in Hong Kong? [Apart from English, Cantonese and Mandarin]
Firstly, we got to know Language(國家,民族等的)語言文字) is different to Dialect (方言,土話) . eg. English, Chinese, French etc are Language, while Cantonese and Mandarin are 2 of the Dialects of China.
Ok, about your question: I guess the language is Phillipino, as we can hear it most places in HK particularly on a tram.