could 在表示能力方面时,只能表示过去能力
He could play the piano when he was five years old.
当他5岁时,他就会弹钢琴。
For my return journey, I felt I could afford the extra and travel first class.
至于回程,我觉得我能多花点钱坐头等舱。
I could see that something was terribly wrong.
我能觉察到有什么事很不对头。
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