英语单词词性分类缩写对照：
1.名词，Noun (n.)
-可数名词，Countable Noun (c./cn.)
-不可数名词，Uncountable Noun(u./un.)
2.代词，Pronoun (pron.)
3.形容词，Adjective (a./adj.)
4.动词，Verb (v.)
-及物动词Transitive Verb (vt.)
-不及物动词Intransitive Verb (vi.)
5.副词，Adverbs（ad./adv.)
6.冠词，Articles (art.)
7.介词，Prepositions (prep.)
8.连词，Conjunctions (conj.)
9.感叹词，Interjections (int.)
