When did he start teaching at this secondary school

11. When did he start teaching at this secondary school ?

-> How long …………………………………………………………………………………………?

12. When did they begin learning Japanese?

->………………………………………………………………………………………………………?

13. I have never chatted on I-phone before.

-> This is the first time ………………………………………………………………………………..

14.  She last met him last Friday.

 -> She hasn’t ………………………………………………………………………………………….

15. The children haven’t been in Hai Phong for 2 months .

-> The last time ………………………………………………………………………………………..