14. Lice began collecting stamps on Sunday. Lice............................................................................................................................................ 15. Hang started being a famous singer when her husband passed away. Hang........................................................................................................................................ 22. How long has she worked in Thanh Hoa? => When……………………………………………………………………………….. 23. When did he learn English wih you? => How long…………………………………………………………………………… 24. How long have they come back to London? => When……………………………………………………………………………….. 25. When did you see that alien? => How long…………………………………………………………………………… 26. How long have you known Mr. Mathew? => When ………………………………………………………………………………

14. Lice has collected stamps since Sunday. 

S + started/began +V_ing ...(khoảng time) + ago ⇔ S + have/has +V3/ed...

15. Hang has been a famous singer since her husband passed away.

S + started/began +V_ing ...(khoảng time) + ago ⇔ S + have/has +V3/ed... (nếu có when + mệnh đề thì đổi when thành since và giữ nguyên mệnh đề)

22. When did she work in Thanh Hoa?

When + did + S + Vo..? ⇔ How long has/have + S + V3/ed ..?

23. How long has he leant English with you? 

When + did + S + Vo..? ⇔ How long has/have + S + V3/ed ..?

24. When did they come back to London?

When + did + S + Vo..? ⇔ How long has/have + S + V3/ed ..?

25. How long have you seen that alien?

When + did + S + Vo..? ⇔ How long has/have + S + V3/ed ..?

26. When did you knew Mr.Mathew?

When + did + S + Vo..? ⇔ How long has/have + S + V3/ed ..?