1. which a place are you go to visit first ?
=> where a place are you go to visit first ?
2. I need buying some flowers of your birthday
=> I need buying some flowers on your birthday
3. when you are at the park ,keep off the grasses
=> when you are in the park, keep off the grasses
(mk hổng biết có đúng hông nhưng thôi mặc kệ)