i had lots of fun （）in the water last sunday这里为什么填playing不填played应该填动词的过去式啊

playing have fun（ in ）doing sth 在做某事方面得到乐趣

have sth in doing

have fun/have a good time (in) doing sth.为固定搭配.且一个简单句中只能有一个谓语,句中已有 had作谓语,所以不能再使用动词了.如果一定要填played的话,应在其前加一个and.