"Have you eaten grapes?" is how you would ask "你吃葡萄了吗" in Engpsh.

This question is using the present perfect tense in Engpsh, which is formed using the auxipary verb "have" or "has" and the past participle of the main verb. In this case, "eaten" is the past participle of the verb "eat."

The present perfect tense is used to talk about actions that started in the past and are still continuing or have recently finished. It is often used to ask about someone's recent activities or experiences.

Here are some example sentences using the present perfect tense:

"I have eaten breakfast already." (我已经吃过早餐了。)
"She has finished her homework." (她已经完成了作业。)
"We have been to Paris twice." (我们去过巴黎两次。)

In the first sentence, the speaker is indicating that they ate breakfast at some point in the past and it is still relevant to the present time. In the second sentence, the speaker is saying that the person has completed their homework at some point in the past and it is still relevant to the present time. In the third sentence, the speaker is saying that they have visited Paris on two occasions in the past and it is still relevant to the present time.