nếu câu này có because thì chuyển thành because of và ngược lại
câu 3:I need to lose weight because I am obese
-> .............
câu 6: because of my stuffy nose ,I can't breath
-> ...................
câu 3:I need to lose weight because I am obese -> I need to lose weight because of being obese câu 6: because of my stuffy nose ,I can't breath -> because my nose is stuffy ,I can't breath