be 动词的用法一、口诀:我用 am， 你用 are， is 用在他她它，复数全用 are。例题：1. I ______ a boy. ______ you a boy? No， I _____ not. 2。 The girl______ Jack’s sister. 3. The dog _______ tall and fat。 4.The jeans ______ on the desk. 二、有 be 动词的肯定句和否定句 I am from London. I am not from London.He is a teacher。 He is not a teacher。She is in the dining room。 She is not in the dining room。 My hair is long。 My hair is not long。 Her eyes are small. Her eyes are not small。 归纳：在有 be 动词的句子中，改否定句时只要在 be 动词______加上_____.三、有 be 动词的一般疑问句 Am I a Chinese？ Yes, you are。 No， you aren't。 Are they American？ Yes， they are. No, they aren't. Is the cat fat？ Yes, it is. No， it isn’t。 四、 Be 动词在一般过去时中的变化：am-—was is -—was are--were ⑴am 和 is 在一般过去时中变为 was。（was not=wasn't）are⑵在一般过去时中变为 were。（were not=weren’t）⑶ 带有 was 或 were 的句子，其否定、疑问的变化和 is, am， are 一样,即否定句在 was 或 were 后加 not,一般疑问句把 was 或 were 调到句首。例题：1. I _______ at school just now。2。 He ________ at the camp last week.3。 We ________ students two years ago.4。 They ________ on the farm a moment ago。5. Yang Ling ________ eleven years old last year。6。 The mobile phone _______ on the sofa yesterday evening.2. 五、there be 句型中 be 动词的用法1、在 there be 句型中，主语是单数，be 动词用 is；主语是复数,be 动词用 are； 如有几件物品，be 动词根据最近 be 动词的那个名词决定。2、there be 句型的否定句在 be 动词后加 not，一般疑问句把 be 动词调到句首。例题：1、There___________ a lot of sweets in the box.2、There___________ some milk in the glass。3、There____________-some people under the the big tree.4、There___________ a picture and a map on the wall。六...
