Footage captured in the city of Chongqing in south-western China shows the 20-year-old male chimpanzee Yu Hui mimic the actions of a tourist as he presses his hands towards the glass and carries out a series of push-ups.
请问此处的mimic的时态？为什么用原形mimic，而不是单三形式mimics。另外这个句子里所有单三形式的动词为什么不用过去式。谢谢解答！
