How do you know if a person is generous? You are good to ta spiritually and materially, and ta will repay you generously? How to take the exam?

You can try to get ta to cook you a meal. If ta doesn't want to do it because of trouble, or hasn't done it before, it can basically be concluded that ta doesn't care much about you and doesn't know how to pay. Whether you are willing to cook for you depends on ta's attitude when cooking. If ta asks you what you like to eat, what flavor you like, looks for tutorials on the Internet, and tries dishes that haven't been cooked for you, then ta really wants to cook for you, which is your dream ta. If you don't ask what you like to eat and use yourself as an excuse to cook some noodles and add some salt, then ta may be a little better to you mentally and a little stingy materially. However, the premise is that you have a good impression in ta's mind and it is worth doing for you. A person can't be nice to a person for no reason.