手早い答え
manhã は朝という時間帯、amanhã は翌日です。
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
manhã
morning
Use manhã for the first part of the day.
amanhã
tomorrow
Use amanhã for the day after today.
選び方
- manhã: Choose manhã if the sentence points to the first part of the day.
- amanhã: Choose amanhã if the sentence points to the day after today.
例文
Estudo de manhã.
I study in the morning.
A aula é amanhã.
The class is tomorrow.
よくある落とし穴
The initial a changes the meaning. Amanhã de manhã means “tomorrow morning” and uses both words.
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manhãで、もう一度はamanhã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。