the grammar made me headache,who can help me ?
who can tell me the difference between
1. I haven't seen you for a long time ,where have you been ?
and
2. I didn't see you for a long time, Where did you go ?
and
3. I haven't seen you for a long time . Where did you go ?

Which is right ? and what's the difference?

Question

the grammar made me headache,who can help me ?
who can tell me the difference between 
1. I haven't seen you for a long time ,where have you been ?
and 
2. I didn't see you for a long time, Where did you go ?
and 
3. I haven't seen you for a long time . Where did you go ?


Which is right ? and what's the difference?

Answer

The grammar gave me a headache, not made me a headache.  Also all three sentences mean the same thing and you can use any one of them.

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!