Rewrite using Direct Speech. Sandra told Marie that she had been trying to call the university for the last hour but the line had been busy.
Marie inquited what Sandra wanted to ask them.
Sandra answered that they had sent out her results the week before but that she hadn't received them yet.
Marie asked Sandra whether she knew that the post office had been on strike for the past week.
She replied that she hadn't known.
She explained that if only she had known, then she wouldn't have wasted so much time on the phone.