Be do和does的用法(3页).doc
-Be do和does的用法-第 3 页系动词Be(am, is, are)的用法一、请记住以下口诀：我用am，你用are，is连着他，她，它； 单数名词用is，复数名词全用are。 变疑问，往前提，句末问号莫丢弃。 变否定，更容易，be后not莫忘记。 疑问否定任你变，句首大写莫迟疑。 be动词的一般现在时有三种形式，即：am, is, are。1. 如果主语是第一人称I（我）时，be动词用am。如：I am a student. 我是一名学生。 I am 还可缩写成I'm。如： I'm David. 我是大卫。2. 如果主语是you （你，你们）, they （他们，它们，她们）或名词复数 （两个以上的人或物）时，be动词必须用are。如：Are you twelve? 你是十二岁吗？ Tom and Lily are good friends. 汤姆和莉莉是好朋友。 They are at school. 他们在学校。are与主语还可缩写。如： We are= We're， They are =They're, You are = You're。而are与 not可缩写成aren't。如：They aren't students. 他们不是学生。但是am与not不能缩写。3. 如果主语是单数名词、不可数名词或单数第三人称代词（he, she, it）时，be动词用is。如:My mother is a teacher. 我的妈妈是一名老师。 He is a student. 他是一名学生。is也可与主语缩写,如: He is = He's, My mother is = My mother's等。但是This is不可缩写。而is与not可缩写成 isn't。如:This isn't a book. 这不是一本书。根据以上叙述我们可以把动词的用法以口诀的形式表述出来：我（I）是am,你（you）是are,剩下is留给她（she）, 他（he）, 它（it）,两个以上都用are.练习：Be动词练习题：1. There _ (be)many monkeys in the mountain. 2. There_(be)a beautiful garden in our school. 3. There _(be)some water in the glass. 4. There _(be)some bread on the table. 5. _(be)Tom _(read) a book now? 6. Where _(be) your friends yesterday? 7. When _ (do)your father usually _ (go) to work? 8. How old _ (be0 you last year? 9. Which dog _ (be)yours? 10. Ten and two _ (be) twelve.do和does的用法do 这个词（does是第三人称单数形式），大体上从两方面来讲。1.作为行为动词，跟其他动词一样，如study, play等。他的意思是“做”等。如：We usually do our homework in the afternoon.He does his homework in the evening.2.作为助动词，也就是帮助主要动词构成否定和疑问等。We don't like bananas.Do you like apples?Does he like English?He doesn't like swimming.上面有一句He does his homework in the evening.要是变成否定句就成了这个样子：He doesn't do his homework in the evening.这里加上了助动词doesn't，而原来的主动词does变成原形do了。作为助动词的do和does是没有词义的，它们在句中的构成一般现在时的疑问句和否定句.Do用于主语第一人称，第二人称和第三人称复数形式的句中，does用于主语第三人称单数的句中。Eg. Do you want to be a teacher? 你想成为一个老师吗？Do his friends go to park every day? 他的朋友们每天都去公园吗？I dont like him. 我不喜欢他。Where does Tom come from? 汤姆来自哪里？I dont know.我不知道。He doesnt live here. 他不住在这儿。练习：改为否定句：1.He has a ping-pong bat.2.She has two ping-pong balls.3.It has four legs.4.Eric has an English teacher5.I play computer games every day.6.We play basketball every day.7.Jane and June play sports every morning.8.They watch TV every evening改为疑问句：1.I have a tennis racket.2.You have a volleyball.
