Question: Do you like Kung Pao Chicken?
Answer: Ah, I haven't eaten that (before). / I ate it yesterday. ("eat"(eaten=past perfect tense) is the verb in this sentence)
Use "过" after a verb to signal that the action was completed.
In 2013, I went to Beijing, Shanghai, and Xi'an.
Went ('to go' in the past tense) is the verb.