手早い答え
ブラジルポルトガル語のser vs. estarを比較：それぞれの単語がふさわしい場面と、避けるべき間違い。
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
ser
to be for identity
Use ser for identity, origin, time, ownership, definitions, and stable qualities.
estar
to be for state or location
Use estar for temporary conditions, location, ongoing results, and how something is right now.
選び方
- ser: Choose ser if the sentence points to identity, origin, time, ownership, definitions, and stable qualities.
- estar: Choose estar if the sentence points to temporary conditions, location, ongoing results, and how something is right now.
例文
Eu sou estudante.
I am a student.
Estou em casa.
I am at home.
よくある落とし穴
Do not decide from the English word "be" alone. Ask whether the sentence identifies something or describes a current state.
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serで、もう一度はestar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。