“either _ or” = is used when there is a choice of two things that must be decided Generally, it is used for choices that must be made now or in the future. 1). In this example, “either - or” is used in the same sentence, and the choice will be made in the future: I will go to EITHER Peru OR Chile next month. In this example, “either - or” are used in two different, but related sentences, and the choice will be made now: 2) Question: Would you like eggs or bacon? Possible Answer: Either one. Possible Answer: Either is fine. “either - or” is only used in the past tense with the helping verb “to have”, in describing a choice made in the past: For his birthday, we HAD to choose between EITHER a party at home OR a party in a park, and we decided on a party in a park.