What language does Taiwan and Hongkong people use in their daily activity? Is it Chinese or English.?

What language does Taiwan and Hongkong people use in their daily activity? Is it Chinese or English.

Public Comments

1. Mandarin and Cantonese respectively. Although in Taiwan they also speak Taiwanese, but Mandarin is the dominant language. In Hong Kong, they also speak English, but Cantonese is the dominant language.
2. Taiwan = Mandarin Hong Kong = Cantonese Many people in Taiwan can also speak, with varying degrees of fluency, Taiwanese. Another prominent minority speaks the Hakka dialect. In Hong Kong, speech is mainly done in Cantonese, although most formal writing is done in Mandarin. There are also a large number of fluent English speakers in Hong Kong due to the prevalence of international business.
3. in HK they use Cantonese (Jyutping + Traditional characters)... in Taiwan they use Taiwanese (pinyin + Traditional characters)... all over the Mainland they use Chinese (pinyin + Simplified characters)...