Which American university are you studying at?中的are 是否可以改成do

Which American university are you studying at?中的are 是否可以改成do OK.Which university are you studying at?What are you studyin Which university are you going to study at? ----Which lesson are you studying now?---______ the school at which we are studying is very good which shcool are you studying in 这句话什么意思 帮我修改下错误把 which do you prefer?Studying in university or worki 1、I have two children.They are studying at university now. What year are you studying at school now. Noise is unpleasant ,e_____ when you are studying at night. Are you good at s----?Yes ,I like studying Where do you come from 中的 do 可以换成 are