THE Hong Kong team face a difficult task at the Commonwealth Championships in Hyderabad, India, next week, when they try to emulate their achievements of the last two events. Hong Kong achieved a clean sweep of the women's titles - singles, doubles and team - and also captured the mixed doubles crown at the 1989 tournament in Wales and repeated the success in 1991 in Kenya. However, top official Tony Yue Kwok-leung said it would be very tough for them to dominate the women's competitions because Canada, Singapore and Australia would be represented by former Chinese players. ''We are strongly fancied in all four events, but it will be a lot more competitive,'' said Yue, chairman of the Hong Kong Table Tennis Association. Although Chai Po-wa won the women's singles crown in Wales and Kenya and is the top seed in India, Yue fears China's world champion Geng Lijuan can stop the Hong Kong ace from completing a hat-trick. Geng will be representing Canada, while another leading contender in the same event is Jing Junhong, who will play for Singapore. Hong Kong's hopes of retaining the mixed title is also seriously challenged by Canada and England. Chan Chi-ming and Chan Tan-lui are the holders but Hong Kong's coach David Cheng Chun-yin said Canada's Geng and Huang Wenguan, another Chinese immigrant, and the English pairing of Chen Xinhua and Lisa Lomas could not be overlooked. Chan Chi-ming is the only experienced international in the men's team which includes four youth players in Cheung Cho-kiu, Wong Yuk-chiu, Chu Chun-chung and Chan Chin-pang.