Table: fa_cup_matches_5
Columns: tie_no
home_team
score
away_team
date

Question: Who was the away team against the home team Sheffield United?
SQL: SELECT "away_team" FROM fa_cup_matches_5 WHERE "home_team" = 'sheffield united'

Question: Who was the away team with a tie of 14?
SQL: SELECT "away_team" FROM fa_cup_matches_5 WHERE "tie_no" = '14'