人称代词,2.1 人称代词主格与宾格,To be,be动词的形式： am Be is are,am 用于第一人称单数I, 可以缩写为Im is用于第三人称单数she, he, it 及所有名词单数。可以缩写为Shes, Hes, Its are用于第二人称及所有人称的复数you, they, we 及复数名词。可以缩小为Youre, Theyre, Were,Exercise 1,2Be动词的用法 1）Be + 名词词组，对主语进行归类、定义，回答主语是什么。 My friend is a good programmer. This is a university. He is an unhappy man. My father is an engineer in his company.,2）Be + 形容词，描述主语，回答主语怎么样。 The story is interesting. The teacher is experienced. I am thirsty. The mountain is beautiful.,3）Be + 介词短语，说明主语的位置、所处的状态等。 The cafeteria is on the first floor. The teacher is in front of us. The students are in a hurry. The classroom is in good condition.,介词加名词构成介词短语。如： in in the school, in the box, in the country On on the beach, on the desk, on the farm At at school, at home, at the bus stop Behind behind the house, behind the door In front of in front of us, in front of the house Under under the desk, under the bed Next to next to the window, next to the gate Between between the two hills Above above the armchair, above the desk. Exercise 2, 3, 4, 5,3. Be动词的否定和疑问 否定句：Be动词后面加not, 可以缩写成下列形式 I am not Im not You are not Youre not You arent He is not Hes not He isnt We are not Were not We arent,一般疑问句：把be动词提到主语前面。简略回答时，be动词不能缩小。如： Im a student. Am I a good student? Yes, you are. Youre late. Are you absent? No, Im not. Hes married. Is he happy? yes, he is. Its warm today. Is it cold today? No, it isnt. They are at school. Are they at home? No, they arent. Lucy is lovely. Is Lucy lovely? Yes, she is.,Exercise 6, 7,特殊疑问句：特殊疑问词提高居首，后面接一般疑问句语序。如： Your teacher is _. Who is your teacher? My name is _. What is your name? You are from _. Where are you from? Labour Day is _ in China. When is Labor Day in China?,Practice: Exercise 6, 7, 8, 9,