Choose the grammatically correct questions

Set 1

• When do you prefer living in the countryside or a city?
• Where do you prefer living in the countryside or a city?

Set 2

• Have you ever been in a valley?
• How you have been in a valley?

Set 3

• Can fresh air help us be healthy?
• Can help air to people be healthy?

Set 4

• Is there any difference between living in the suburbs and in a city?
• Do there difference between living in the suburbs and in a city?

Set 5

• Which trees do you usually plant in an orchard?
• What trees do you usually plant in an orchard?

Set 6

• Who you think is healthier, a person who lives in a rural area or a person who lives in an urban area?
• Who do you think is healthier, a person who lives in a rural area or a person who lives in an urban area?