CREATE TABLE "liverpool" (
  "round" text,
  "opposition" text,
  "first_leg" text,
  "second_leg" text,
  "aggregate_score" text
);

Question: What was the first leg of the semi-final?
SQL: SELECT "first_leg" FROM "liverpool" WHERE "round"='semi-final';

Question: What was the first leg score against Real Sociedad?
SQL: SELECT "first_leg" FROM "liverpool" WHERE "opposition"='real sociedad';

Question: What was the first leg against Hibernian?
SQL: SELECT "first_leg" FROM "liverpool" WHERE "opposition"='hibernian';

Question: Who were the opposition in the quarter-final?
SQL: SELECT "opposition" FROM "liverpool" WHERE "round"='quarter-final';