have eaten dinner

1. I have eaten dinner.(这句话有问题吗? 是不是完成时后要加时态？)

2.如果回答是这句话，那么怎么问？是不是：Have you eaten dinner?(这里的eaten要写成原形eat 吗？)
1.是不是现在完成是可以不加时间，还是所有完成时都可以不加时间？

2.所有的完成时的提问 是不是动词都是用动词分词的形式？就是只把have(has...)提前？

Tell me about an unusual place that you have eaten? i have eaten that food for thre years. Have you ever eaten French cheese?和Had you ever eaten French cheese?这里有什么语法? All that can be eaten( )eaten up ___ you have eaten the box of chocolates, you will know the taste of life.A.when B.Before C.Until Have ( ). 关于eaten和ate的用法 I was sure I had eaten my lunch Neither the children nor he （ ）ever eaten （ ）supper. I was eaten cakes by my younger brother.