A could表示能力
1 could表示目前的能力时在间接引语中保持不变:
I cant/couldnt stand on my head,he said.
他说:我不能做三点倒立。相当于:
He said he couldnt stand on his head.
他说他不能做三点倒立。
2 could表示将来的能力时,在间接引语中可以保持不变,或由would be able结构来转述:
He said,I could do it tomorrow.
他说:我明天能做这事。相当于:
He said he could do it/would be able to do it the next day.
他说他第二天能做这事。
3 条件句类型2中,主句中的could与A2中的变化相同:
If I had the tools I could mend it,he said.
他说:如果我有工具的话,我就能修补它。相当于:
He said that if he had the tools he could/would be able to mend it.
他说如果他有工具的话,他就能修补它。
would be able在这里暗指所假设的情况有可能实现(可能他可以借到工具。)
4 条件句类型3中,could被转述时保持不变。
5 could表示过去的能力时,在间接引语里保持不变,或用had been able结构转述:
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