Hi, The first two are correct but can be improved to sound more natural. The last one is incorrect in my opinion. I have suggestions below. Your version: What kind of classes have you found interest you the most? My version: What classes have you found the most interesting? Your version: You have to do the things you like to do the most My version: You should do the things you like the most. Your version:What city do you think you want to travel the most? My version: What city would you like to travel to the most? - I still think this can be better but it depends on what you are asking. Are you asking which city they want to travel to the most out of all cities or which city they want to travel within the most? I think it would be better to ask a question about preference. i.e. if you could visit any city in the world, which city would you choose? or which city would you prefer to travel to? If you want some explanations please feel free to message me. I hope this was helpful. Evie

- What kind of classes have you found the most interesting ? or Which classes interests you the most? - You should do things you most like doing. - Which city in the world would you like to visit? I believe that there might be more options.