～とともに— Along With, As

• 家族とともに新しい町で暮らし始めた。

  Kazoku to tomo ni atarashii machi de kurashi hajimeta.

  I began living in a new town together with my family.

  とともに means 'together with' the family (accompaniment).

• 年を取るとともに、体力が落ちてきた。

  Toshi o toru to tomo ni, tairyoku ga ochite kita.

  As I grow older, my stamina has declined.

  とともに links two changes: aging and declining stamina occur in tandem.

• 彼はリーダーであるとともに、優れた研究者でもある。

  Kare wa riidaa de aru to tomo ni, sugureta kenkyuusha demo aru.

  He is a leader as well as an excellent researcher.

  とともに means 'as well as', joining two simultaneous roles.

• ・With change verbs (増える, 変わる, 進む) it means 'as one thing changes, so does another'.
• ・More formal/written than 一緒に; common in essays and news.
• ・Noun + とともに can mean accompaniment ('together with') or addition ('as well as').

Commonly confused with

The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ～とともに is tested against.

• ～一方(で) — On One Hand, On the Other
• ～上(に) — On Top of That
• ～くせに — And Yet You Dare
• だけでなく — Not Only That
• ついでに — While You're At It
• ～つつ(も) — While Yet Doing Otherwise
• ～というと／～といえば — Speaking Of That
• ～といっても — Even Though I Say