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"Did you know you could do that.?" Is "could" acceptable and why?

Is it correct to use "could" here?

Did you know you could do that?

What grammar rule do I have to look at to reliably answer those questions myself?

"Did you know you could do that.?"

Is it correct to use "could" here? What grammar rule do I have to look at to reliably answer those questions myself?

"Did you know you could do that?" Is "could" acceptable and why?

Is it correct to use "could" here?

Did you know you could do that?

What grammar rule do I have to look at to reliably answer those questions myself?

1
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"Did you know you could do that.?"

Is it correct to use "could" here? What grammar rule do I have to look at to reliably answer those questions myself?