◆ 現在や未来の能力 について話す場合と、 過去の全般的な能力 について話す場合は、 can / could と be able to を同じ意味で使える。 She can speak Spanish very well. \ / この2つの文は同じ意味 She is able to speak Spanish very well. I could run much faster when I was younger. \ / この2つの文は同じ意味 I was able to run much faster when I was younger. ※ ただし、以下のように現在完了時制の場合や ...ing 形にする場合、 can / could は使えないので、 be able to を使う必要がある。 He has been able to swim since he was two years old. I like being able to choose my own working hours. ◆ 過去の特定の時点における特定の能力 について話す場合、 could を使うことはできない。 The traffic was really bad, but we could catch our train. ← この文は間違い ↓ The traffic was really bad, but we were able to catch our train. The traffic was really bad, but we managed to catch our train. ※ ただし、否定形の場合は、内容が全般的か特定的かにかかわらず could を使え...
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