The word ‘eager’ itself is an adjective and does not have a past tense form. Adjectives typically describe a state or quality and do not change with time like verbs do. If you are looking to express a sense of eagerness in the past, you might say something like ‘was eager’ to indicate that someone had a strong desire or enthusiasm in the past.
For example, you could use it in a sentence like: ‘She was eager to start her new job last year.’ Here, ‘was’ indicates the past tense, while ‘eager’ describes her feeling at that time.