The verb "learn" is fundamental in English, used to describe the process of acquiring knowledge or skills through study, experience, or teaching. it can be both regular and irregular, depending on regional preferences.

In the present simple tense, "learn" follows its base form for most subjects: "I learn," "you learn," "he/she/it learns," and so forth. For example, "She learns new languages quickly."

In the past simple tense, "learn" can change to either "learned" (regular) or "learnt" (irregular, more common in British English). This form is used to describe actions of acquiring knowledge or skills that were completed in the past. For instance, "He learned/learnt to play the piano when he was a child."

The past participle of "learn" can also be "learned" or "learnt." When forming perfect tenses, such as the present perfect or past perfect, the past participle is combined with auxiliary verbs. An example sentence is "They have learned/learnt a lot from their travels."

"Learn" is usually used as a transitive verb, meaning it requires a direct object to complete its meaning: "She learned the recipe by heart." However, it can also be used intransitively in certain contexts: "He learns quickly."

The verb "learn" is often found in various idiomatic expressions and phrasal verbs, such as "learn by heart" (to memorize), "learn the ropes" (to understand how things are done), and "live and learn" (to grow wiser through experience).

Understanding the conjugation and usage of "learn" is essential for accurately describing actions related to acquiring knowledge or skills. Its flexibility in both regular and irregular forms, especially in British and American English, adds to its richness and adaptability in the language.