I / playing badminton / Nam / when / my friends / came / with / was / .  A. I came with Nam when my friends was playing badminton.  B. I playing badminton with Nam when my friends was came.  

I came with Nam when my friends was playing badminton.

I playing badminton with Nam when my friends was came.

I was playing badminton when Nam with my friends came.

I was playing badminton with Nam when my friends came.