Did.you.have.fun.caming中为什么要加have

Did.you.have.fun.caming中为什么要加have did you have breakfast,中间的为什么要加have did you have receive my email 中的have 为什么要加have did you have fun---(watch)the game?为什么要用ing形式? Did you have fun?英语回答 “Did you have fun camping”是什么意思吖? did you have fun怎么用, Did you have fun ______the palace Museum? Did you have fun in Beijing Did you havedinner?为什么要用have did you have fun leaning english last term 为什么用leaning did you have fun watching the game 里面为什么用watching 而不是 watch