A1 used before nouns to refer to particular things or people that have already been talked about or are already known or that are in a situation where it is clear what is happening（用於名詞前，指聽者或讀者已知的事物或人，尤指已提到的或能被領會的事物或人）

A1 used before some nouns that refer to place when you want to mention that type of place, without showing exactly which example of the place you mean（用於某些名詞前，表示泛指一類地方）

A1 used before noun phrases in which the range of meaning of the noun is limited in some way（用在帶有限制性定語的名詞短語前）

A1 used to refer to things or people when only one exists at any one time（指獨一無二的事物或人）

A2 used before superlatives and other words, such as "first" or "only" or numbers showing something's position in a list, to refer to only one thing or person（用於形容詞或副詞最高級及表示排名的詞前）

used to say that the particular person or thing being mentioned is the best, most famous, etc. In this use, "the" is usually given strong pronunciation（用於表示“最…的”，此時 the 應重讀）

used before some adjectives to turn the adjectives into nouns that refer to one particular person or thing described by the adjective（用在形容詞前，指特定的人或事物）

used before some adjectives to turn the adjectives into nouns that refer to people or things in general that can be described by the adjective（用在形容詞前構成名詞，泛指一類人或事物）

used before a singular noun to refer to all the things or people represented by that noun（用在單數名詞前，指該類事物或人）

used before a family name to refer to two people who are married or to a whole family（用在姓氏前表示某夫婦或一家人）

used before some nouns referring to musical instruments or dances to mean the type of instrument or dance in general（用在樂器或舞蹈的名稱前表泛指）

used before a noun to represent the activity connected with that noun（用在名詞前表示與名詞有關的活動）

B2 used before numbers that refer to periods of ten years（用在逢10的數字前）

B2 used before each of two comparative adjectives or adverbs when you want to show how one amount gets bigger or smaller in relation to the other（用在兩個形容詞或副詞比較級前，表示“越…越…”）

used before comparative adjectives or adverbs when you want to show that someone or something has become more or less of a particular state（用在形容詞或副詞比較級前，表示某人或事物的特定狀態的變化）

used for emphasis when you are expressing a strong opinion about someone or something（用於強調所持看法）

B1 used instead of a possessive adjective such as your, her, or my（用於代替 your，her，my 等詞）

enough足夠的

each; every每個