Phrasal verbs are crucial for English learners as they are pervasive in everyday English language, both in spoken and written forms. These verbs, which combine a basic verb with one or more particles (prepositions or adverbs), often carry idiomatic meanings that cannot be easily deduced from the individual words. By understanding and mastering phrasal verbs, learners can significantly improve their fluency and comprehension, enabling them to express themselves more naturally and understand native speakers more effectively.