常见题型：语法填空、选择题、完形填空
冠词是虚词，不能独立使用，置于名词前帮助说明名词的指称意义。分为不定冠词(a/an)、定冠词(the)和零冠词(即不加冠词)。a用于辅音音素前，an用于元音音素前(注意是音素不是字母！)。
一、不定冠词a/an 5种用法：
① 泛指某类事物中的"一个": I need a pen to write with. 我需要一支笔来写。
② 首次提及: A man is waiting for you at the gate. 门口有个男人在等你。
③ 表示"每一": Take this medicine three times a day. 这药一天吃三次。
④ 用于固定搭配: have a try/a rest/a walk/a cold/a good time; in a hurry/in a word/as a result
⑤ 用于such/quite/rather/what后: What a beautiful flower! 多漂亮的花！She is quite a clever girl. 她是个相当聪明的女孩。
⚠️ a/an选择看音素: an hour(/aʊə/以元音开头) | a university(/juː/以辅音开头) | an honest man(/ˈɒnɪst/以元音开头)
二、定冠词the 8种用法：
① 特指(T): The book on the desk is mine. 桌上的那本书是我的。
② 独一无二(U): The sun rises in the east. 太阳从东方升起。
③ 上文提及(R): I saw a dog. The dog was black. 我看到一条狗，那狗是黑色的。
④ 序数词/最高级(O): This is the best film I have ever seen. 这是我看过最好的电影。
⑤ 乐器(E): She plays the piano very well. 她钢琴弹得很好。
⑥ 江河山脉海峡沙漠(S): the Yangtze River/the Pacific/the Alps/the Sahara
⑦ 姓氏复数表一家人: The Smiths are having dinner. 史密斯一家在吃晚饭。
⑧ 固定搭配: in the morning/the day after tomorrow/by the way/on the other hand
三、零冠词5种：
① 球类/棋类: play basketball/chess (⚠️ 不是play the basketball)
② 三餐: have breakfast/lunch/dinner
③ 交通工具(by + 无冠词): by bus/bike/train/plane (⚠️ 但take a bus/catch the train)
④ 头衔/职位: He was elected president. 他被选为主席。
⑤ 泛指复数/不可数: Books are our friends. 书是我们的朋友。Water is essential for life. 水对生命至关重要。
语法填空1题 + 选择题0-1题, 约占语法总分8%