How to say "Be" in Japanese

When translating "be" into Japanese, you must choose carefully between 役立つ and 共通する. In Japanese, 役立つ (やくだつ (yakudatsu)) is typically associated with "to be useful, to be helpful" (Syllabus Level: N3) and represents An intransitive verb. Used to describe something that serves a purpose or provides assistance. Often followed by に.. On the other hand, 共通する (きょうつうする (kyōtsūsuru)) maps to "to be common; to share (something)" (Syllabus Level: N3) and represents Used when two or more people or things possess or share the same characteristic, interest, or quality. Can be used as a verb. A literal translation of "be" can often sound unnatural to native Japanese speakers if mixed up!