How to say "Be" in Japanese

When translating "be" into Japanese, you must choose carefully between 売れる and 活躍する. In Japanese, 売れる (うれる (ureru)) is typically associated with "to be sold; to sell well; to be in demand" (Syllabus Level: N4) and represents Intransitive verb. On the other hand, 活躍する (かつやくする (katsuyaku suru)) maps to "to be active; to play an active part; to flourish" (Syllabus Level: N3) and represents Often used to describe someone performing well or playing a significant role in a specific field, event, or situation.. A literal translation of "be" can often sound unnatural to native Japanese speakers if mixed up!