For the present perfect tense:
* "avoir été" (formal, general)
* "être allé(e)" (for going somewhere, literally "to have gone")
* "être resté(e)" (for staying somewhere, literally "to have stayed")
* "être venu(e)" (for coming somewhere, literally "to have come")
Examples:
* "J'ai été à Paris." (I have been to Paris.)
* "Il est allé à la plage." (He has been to the beach.)
* "Elle est restée chez elle." (She has stayed at home.)
* "Nous sommes venus en France." (We have come to France.)
For the past perfect tense:
* "avoir été" (formal, general)
* "être allé(e)" (for going somewhere, literally "to have gone")
* "être resté(e)" (for staying somewhere, literally "to have stayed")
* "être venu(e)" (for coming somewhere, literally "to have come")
Examples:
* "J'avais été à Paris." (I had been to Paris.)
* "Il était allé à la plage." (He had been to the beach.)
* "Elle était restée chez elle." (She had stayed at home.)
* "Nous étions venus en France." (We had come to France.)
For the imperfect tense:
* "être" (general)
* "aller" (for going somewhere, literally "to go")
* "rester" (for staying somewhere, literally "to stay")
* "venir" (for coming somewhere, literally "to come")
Examples:
* "J'étais à Paris." (I was in Paris.)
* "Il allait à la plage." (He was going to the beach.)
* "Elle restait chez elle." (She was staying at home.)
* "Nous venions en France." (We were coming to France.)
Remember to conjugate the verb according to the subject and tense you are using.