Answer the following questions. Your answers should be clear and short.What are the types of antonyms? Explain the types of antonyms with the following example words：sell/buy, same/different, old/young.
ANTONYMS CAN BE DEFINED AS WORDS WHICH ARE OPPOSITE IN MEANING.  THEY CAN BE CLASSIFIED INTO THREE MAJOR GROUPS：CONTRADICTORY TERMS；CONTRARY TERMS；RELATIVE TERMS. 
1.RELATIVE TERMS: CONSISTS OF RELATIONAL OPPOSITES SUCH AS SELL/BUY. SUCH PAIRS OF WORDS INDICATE SUCH A RECIPROCAL SOCIAL RELATIONSHIP THAT ONE OF THEM CANNOT BE USED WITHOUT SUGGESTING THE OTHER.
2.CONTRADICTORY TERMS: THEY ARE SO OPPOSED TO EACH OTHER THAT THEY ARE MUTUALLY EXCLUSIVE AND ADMIT NO POSSIBILITY BETWEEN THEM, SUCH AS SAME/DIFFERENT. ONE THING IS EITHER SAME OR DIFFERENT, AND THERE EXISTS NO SUCH A CASE WHERE THE THING IS BOTH SAME AND DIFFERENT.
3.CONTRARY TERMS ARE BEST VIEWED IN TERMS OF A SCALE RUNNING BETWEEN TWO POLES OR EXTREMES, SUCH AS OLD/YOUNG.  
