用英语怎么说吃完饭

To say that you have eaten in English, you would say "I have eaten" or "I have finished eating". This phrase comes from the verb "to eat", which means to consume food. Here are some example sentences:

"I have eaten lunch already." (我已经吃完午饭了。)
"We have eaten all of the cookies." (我们已经吃完所有的饼干了。)
"I will have eaten dinner by the time you get home." (你回家的时候我已经吃完晚饭了。)

In English, the verb "to eat" is often used in the present perfect tense to indicate that an action has been completed. This is done by using the auxiliary verb "have" followed by the past participle of the main verb. In the case of "eat", the past participle is "eaten". So, to say that you have eaten in English, you would say "I have eaten" or "I have finished eating".