.,Unit 1 Making New Friends Topic 3 How old are you? Section B,.,a desk,a pen,a pencil,Warming up,.,a book,a bus,a box,a map,.,an apple,an orange,an egg,an eraser,.,在英语中，a, an和the称为冠词，其中a和an是不定冠词，the是定冠词。不定冠词a和an 都可以表示“一(个、支、张、块)”的意思。它们在用法上有什么区别呢？请仔细观察下面的例子，然后补全结论部分所缺内容。,a和an,.,A. a “w”, an “s”, an “f” B. an egg, a ruler C. a red apple, an English teacher D. Is that his map? This is my schoolbag. She is in this room.,.,【结论】 1. 从A、B组例子中可以看出，_ 用在以辅音音素开头的字母或单数名词之前，_ 用在以元音音素开头的字母或单数名词之前。 2. 从C组例子中可以看出, 当名词前有修饰语时，应以_ (名词 / 修饰语)开头的音素决定用a还是用an。 3. 从D组例子中可以看出，若名词前有物主代词his, my等或指示代词this, that 等修饰限定时, _ (能 / 不能)同时使用冠词。,an,a,修饰语,不能,.,【运用】 请选用a或an完成下列句子或对话。 1. It isnt _ “u”. Its _ “v”. 2. Is that _ egg? Yes, its _ big egg. 3. Whats this in English? Its _ English book. 4. Its _“h”, not _ “n”.,a,a,an,a,an,an,an,.,A: Whats this in English? B: Its a pen. A: How do you spell it, please? B: P-E-N, pen.,Pair work,.,A: Whats this in English? B: Its a book. A: Can you spell it, please? B: B-O-O-K, book .,.,A: Whats this in English? B: Its a bag. A: How do you spell it, please? B: B-A-G, bag.,.,-Is this a pencil? -Yes, it is.,.,A: Is this an orange? B: No, it isnt. Its an apple.,.,-Is that a car? -No, it isnt. Its a bus.,.,Is this / that a / an? Yes, it is. / No, it isnt. Its a / an,.,Complete the conversations.,A: Whats this in English? B: _ a pencil-box. A: Can you spell it, please? B: _,Its,P-E-N-C-I-L-B-O-X, pencil-box.,.,A: Whats that in English? B: _ an apple. A: _? B: A-double P-L-E, apple.,Its,How do you spell it,.,A: Is this an eraser? B: Yes, _.,A: Is that a pen? B: No, _. It is a pencil.,it is,it isnt,.,I. Choose the right answer. _ do you spell it, please? A. What B. How C. Where 2. - Is that a car? - No, _. A. it isnt B. that is C. that isnt 3. - This is _ eraser. - _ her eraser. A. a; Its B. an; Its C. an; Its,B,A,C,练习坊,.,4. Its my ruler. (改为否定句) It _ my _. 5. Whats this _ (用英语)？ Its _ (一支铅笔).,isnt,ruler,in English,a pencil,.,II. 请选用a / an完成下列句子。 1. She is _ English girl. 2. It is _ good apple. 3. Its _ “m”, not _ “w”. 4. That is _ old car. 5. This is my mom. She is _ teacher.,an,a,an,a,an,a,.,III. 请根据所给情景用适当的词语完成下列句子或对话。 1. Excuse me, is this your toy? Yes, _ is. 2. Whats that in English? _ a ruler.,it,Its,.,3. _ you _ it, please? Yes, I can. 4. _ that an egg? Yes, _ is. 5. This _ a car, but its a bus.,Can,spell,Is,it,isnt,.,