Each word in Column I can be paired up with a word in Column II according to a certain pattern. What is the pattern, and what are the new words?

        I                                      II
1. APES                               TRY
2. ARC                                KING
3. ARE                                  AN
4. BRAG                             TICS
5. BUS                                CLING
6. CURT                              SHED
7. FLEW                             RATE
8. LAP                                  HIM
9. NAMES                           LED
10. PARES                           SURE
11. SUM                              AGE
12. TRAPS                          DUE
13. WARD                           ARE

HINT:
The same thing has to be done to every word in Column I before it can be paired up with a word in Column II.

Answers:

Each word in Column I must be reversed to pair up with a word in Column II:

1. SEPARATE
2. CRASHED
3. ERASURE
4. GARBAGE 
5. SUBDUE
6. TRUCKING
7. WELFARE
8. PALTRY 
9. SEMANTICS
10. SERAPHIM
11. MUSCLING
12. SPARTAN
13. DRAWLED

Credit:
Francis Heaney
FLIPPERS
From BRAIN GAMES FOR WORD NERDS