The present perfect tense is formed with have/has + a past participle. There are several situations in which we use this tense:
To talk about something that was true in the past, and is still true in the present, as in, “I have been married for five years.”
To talk about something that happened at an unspecified time in the past, as in, “Becky has visited China several times already.”
To talk about something that happened during a period of time that has not yet ended, as in, “I have gone to three parties so far this month.”
When used with “just,” to talk about something that happened very recently, as in, “My mother has just arrived.”
To ask someone if they have gone somewhere and returned or if they have done something, as in, “Have you been to the new restaurant?” In this case, it is formed with have/has + subject + a past participle.
When you see words like for, since, ever, already, and so far in a sentence, it often means that you need to use the present perfect tense.