IMHO it is OK. Just think of it as past time of "can". What is it that you don't like?
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AnonymousHi, Please check the usage cases of the modal verb "could."
1. When I was ten years old. I could play tennis well. You had the general ability to play tennis well at the age of ten. It is not clear from this sentence alone whether or not you still play tennis well.
2. For three years before entering college,
Marius HancuBoth past and present/future:Dear Marius Hancu,
If I enroll in that course, I could, at the end of it, play tennis quite well. Hypothetical future