Not always. As in your reported speech example , yes, it can be considered to be the past of "can" To talk about sb's abilities in the past, yes, it can be considered to be the past of "can" eg: She could finish reading a whole book in two days when she was younger. , it can be considered to be the past of "can" When I arrived home yesterday, I could smell something burning.
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AnonymousHi. I think I have heard people say plenty of times that the modal "could" is past of the modal "can."Yes, as a non-native speaker who has struggled with this sort of grammar for a long time, I would take it that way. I think you can use "could" every time yo