run is my favourite sport.这句话前面的run用原形还是用现在分词?

run is my favourite sport.这句话前面的run用原形还是用现在分词? 是my favourite sport is run.还是my favourite sport is running. my favorite sport is run还是running run的现在分词 run的现在分词running前面要加be吗? run 的现在分词是什么 run的现在分词是什么 run的现在分词形式 Running has become my favourite sport.这句话中的时态是什么?现在完成还是一般现在? We're run out of money to buy books这句话中run怎么用了原形? run(现在分词） run现在分词