Question #f352b English Grammar Tenses Past ↳Redirected from "An electron in a hydrogen atom drops from energy level n=5 to n=3. What is the energy transition using the Rydberg equation?" 1 Answer Gazza Jan 22, 2018 A verb you can use that indicates you are referring to something that is gone or something you did. For example, I eat "Eat" is in the present tense. The past tense of "to eat" is "ate." Ex: I ate the sandwich. This is phase these because you already ate the sandwich. Answer link Related questions Is past perfect the same as past participle? What is the difference between past perfect tense and past perfect continuous tense? What is the difference between past simple and past continuous tenses? What is the past tense and perfect tense? What is the difference between simple past and past participle? What are examples of sentences using simple past? How do you change the sentences into present... What is the past tense for the word "learn"? What is the past tense of the word "cost"? What is the past tense of the word "hurt"? What is the past tense of the word "regret"? See all questions in Past Impact of this question 2630 views around the world You can reuse this answer Creative Commons License