The iconic words of the present perfect tense

The present perfect tense is a grammar tense that indicates that an action continues to develop on the basis of what happened in the past. Its symbolic word is already probable. For example, I have already eaten means that I am still eating on the basis of eating at a certain time in the past. He has gone to the United States, which means that he has been to the United States at some time in the past and is still in the United States.