手早い答え
afim は「関連する」という形容詞、a fim de は目的を表す3語の表現です。
確実な見分け方は、英語から訳す前に、その単語の働きを見きわめることです。
それぞれの単語の働き
afim
related, similar, or by affinity
Use afim for ideas, fields, people, or relatives connected by similarity or affinity.
a fim de
in order to
Use a fim de for introducing a purpose or intended result.
選び方
- afim: Choose afim if the sentence points to ideas, fields, people, or relatives connected by similarity or affinity.
- a fim de: Choose a fim de if the sentence points to introducing a purpose or intended result.
例文
As duas pesquisas tratam de temas afins.
The two studies address related topics.
A equipe se reuniu a fim de revisar o plano.
The team met in order to review the plan.
よくある落とし穴
When para can replace the expression, write a fim de separately. The informal estar a fim de also remains separate.
文脈の中で練習する
自分の実生活から文を一つ選び、二回書いてみましょう。一度はafimで、もう一度はa fim deで。どちらも成り立ちそうなら、意味の違いを言葉にしてみましょう。