| 单词 | could | 
| 释义 | couldauxiliary verbkəd,ˈku̇d past tense of can    —used in auxiliary function in the past  We found we could go., in the past conditional  We said we would go if we could., and as an alternative to can suggesting less force or certainty or as a polite form in the present  If you could come, we would be pleased. | 
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