1. When did you buy it?
· How long have have you bought
· How long agn did you buy it?
· How long is it since you bought it?
· How long has been since you bought it?
2. When did you come here?
· How long have you come here?
· How long ago did you come here?
· How long Lace you came here?
How long has it been since you came here?
3. When did you start leaming english?
· How long have you learned English?
· How long age did you start learning English?
· How long is it since you learned English?
· How long has it been since you learned English?
4. When did you start working in this factory
· How long have you worked in this factory?
· How long ago did you start working in this factory?
· How long is it since you worked in this factory?
· How long has a been since you worked in this factory?
5. When did you first meet him
· How long have you first met him?
· How long ago did you first meet him?
· How long is it since you first met him?
· How long has it been since you first met him?

6. When did they get married?
· How long have they got married?
· How long ago did they get married?
· How long is it since they got married?
· How long has it been since they got married?
* Cấu trúc

→ How long + have/has + S + Ved/3?

→  How long ago + did + S + bare verb + O?

→ How long is it since + S + Ved/V2?

#uni_tinaka