手早い答え
pegar はつかむ瞬間、segurar はそのまま持ち続けることです。
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
pegar
to take, pick up, or catch
Use pegar for getting hold of something, collecting it, or catching transport.
segurar
to hold or keep steady
Use segurar for continuing to hold something or preventing it from moving.
選び方
- pegar: Choose pegar if the sentence points to getting hold of something, collecting it, or catching transport.
- segurar: Choose segurar if the sentence points to continuing to hold something or preventing it from moving.
例文
Vou pegar o ônibus.
I am going to catch the bus.
Segure minha bolsa, por favor.
Hold my bag, please.
よくある落とし穴
For transport, use pegar: pegar o ônibus. Segurar o ônibus would mean physically holding or delaying it.
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pegarで、もう一度はsegurar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。