I've learned that this expression is more like to persuade someone than asking the reasons
I want to make sure of what i'm thinking
When i say
- Why don't you take that class?
Is more like persuading and listener wouldn't say the reason
So If i wan't to know the reason, should i say
- Why you don't take that class?
Can i use the first sentence(number one) just to know the reason?
But when it comes to past tense, would it definitely be an interrogative sentence?
- Why didn't you take that class?
- Why you didn't take that class?
Both are expected that listener would say the reason