If I have a bad knee it implies that the knee is hurting, so it means the same as my knee hurts. The pain does not have to be chronic and may be caused by a graze or a slight strain. So why is "I have a bad knee " considered incorrect ?
I need the context to answer your question.
If this is in a quiz, please re-post using the Report It button on your correction board as it will link directly to the quiz in question.
Sign in to submit your answer
Don't have an account yet? Join today
Test your French to the CEFR standard