你这个句子的回答应该是:
Yes,I did.是的,我吃了.No,I didn't.不,我没有吃.
你说的那个回答yes 表示不的意思 是在否定的疑问句或者前否后肯的反义疑问句中的.如:
Didn't you go to school yesterday?(否定疑问句)
Yes,I did.不,我去了.
No,I didn't.是的,我没有去.
You didn't go to school yesterday,did you?(前否后肯的翻译疑问句)
Yes,I did.不,我去了.
No,I didn't.是的,我没有去.