1.How long have you learnt French? -> How long ago 2.How long is it since you bought this house? -> How long 3.I haven't been to the zoo for six months ->The last time 4.This is my first visit to Hue ->This is the first time 5.My aunt began her career as an English teacher at school six months ago -> My aunt has 6.When did you hear from Robert? -> How long is 7.When did Mary start to listen to classical music? ->How long 8. It isn't necessary for students to wear uniforms today -> Students 9. I visited London two years ago -> It is 10.He hasn't been back to his village for over 20 years -> It has been Cho mình hỏi mấy câu này dạng gì vậy chưa mình thấy khó quá không làm được cái nào. Mì nh cảm ơn trước ạ