Viết lại các câu sau sao cho nghĩa không thay đổi: This is the first time he went abroad

1. viết các câu sau sao cho nghĩa không thay đổi
1. this is the first time he went abroad
---> he hasn't
2. we began eating when it started to rain
----> we haven
3. when did you have it ?
----> how long
4. it is a long time since we last met
----> we haven't