adjective ： a word that describesa person or thing, for example big , red and clever in a big house , red wine and a clever idea 形容词
adverb：a word that adds more information about place, time, manner, cause or degree to a verb, an adjective, a phrase or another adverb 副词
conjunction ： a word that joins words, phrases or sentences, for example ‘and’, ‘but’, ‘or’ 连词， 连接词 （如and、but、or）
determiner：a word such as the , some , my , etc. that comes before a noun to show how the noun is being used 限定词（置于名词前起限定作用，如the、some、my等）
exclamation：a short sound, word or phrase spoken suddenly to express an emotion. Oh! , Look out! and Ow! are exclamations . 感叹；感叹语；感叹词
interjection：a short sound, word or phrase spoken suddenly to express an emotion. Oh! , Look out! and Ow! are interjections . 感叹词；感叹语
noun ：a word that refers to a person, (such as Ann or doctor ), a place (such as Paris or city ) or a thing, a quality or an activity (such as plant , sorrow or tennis ) 名词
phrasal verb： a verb combined with an adverb or a preposition, or sometimes both, to give a new meaning, for example go in for , win over and see to 短语动词；动词词组
plural ：a form of a noun or verb that refers to more than one person or thing （名词或动词的）复数，复数形式
preposition：a word or group of words, such as in , from , to , out of and on behalf of , used before a noun or pronoun to show place, position, time or method 介词
prepositional phrase ：A prepositional phrase is a structure consisting of a preposition and its object. Examples are “on the table” and “by the sea.” 介词短语; 前置词短语
pronoun ： a word that is used instead of a noun or noun phrase, for example he , it , hers , me , them , etc. 代词（代替名词或名词词组的单词）
singular ： a form of a noun or verb that refers to one person or thing 单数；单数形式
verb： a word or group of words that expresses an action (such as eat ), an event (such as happen ) or a state (such as exist ) 动词