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.

ご自宅で快適に語学を学べるチャンスをお見逃しなく。経験豊富な語学講師陣の中からお選びいただき、今すぐ最初のレッスンにお申し込みください！