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参考答案

Antonyms are words which are opposite in meaning. There are three different types of antonym as follows: 

 Gradable antonyms – pairs of words opposite to each other, but the positive of one word does not necessarily imply the negative of the other, or vice versa. For example, the words hot and cold are a pair of antonyms, but not hot does not necessarily mean cold, maybe warm, mild or cool. Therefore, this pair of antonyms is a pair of gradable antonyms.

 Complementary antonyms – words opposite to each other and the positive of one implies the negative of the other: alive/dead

 Reversal (relational) antonyms – words that denote the same relation or process from one or the other direction: push/pull, up/down, teacher/student.