Playing tennis is Li Na's favourite sport.(改为同义句)

问题描述:

Playing tennis is Li Na's favourite sport.(改为同义句)
______Li Na's favourite sport _____ ______ _______.

Li Na's favourite sport 是名词词组,作主语时前面不需要加入任何引导词.因此可以考虑正确答案为:And Li Na's favourite sport is playing tennis.