gsmcat
幼苗
共回答了17个问题采纳率:88.2% 举报
一 、be动词的几种形式和基本用法 am 当主语是第一人称单数(I)时用 is 当主语是第三人称单数(he,she ,it )时用 are 当主语是you ,we和所有复数时用 was 在过去时中,当主语是第一人称单数,第三人称单数时替换am 和is were 在过去时中,当主语是we ,you和所有复数时用,即替换are. 二 、be动词的两种句子形式 (一) 肯定形式:主语+be+其它.例如: 1.I am (I’m) a doctor. 2.You are (You’re) a doctor. 3.He is (He’s ) a doctor. 4.She is (She’s ) a doctor. 5.It is (It’s ) a cat. 6.This is a desk. 7.That is a desk . 8.We are (We’re ) doctors. 9.You are (You’re ) doctors. 10.They are (They’re )doctors. 11.These are desks. 12.Those are desks. (二)否定句形式:主语+ be + not+其它 (构成方法:肯定句变否定句,只要在be 后+not 即可) 以上面的句子为例,将肯定句变为否定句. 1.I am not a doctor.(注:am 和is 不能缩写 ) 2.You are not (aren’t ) a doctor. 3.He is not (isn’t ) a doctor. 4.She is not (isn’t ) a doctor. 5.It is not ( isn’t ) a cat. 6.This is not (isn’t ) a desk. 7.That is not (isn’t ) a desk . 8.We are not (aren’t ) doctors. 9.You are not (aren’t ) doctors. 10.They are not (aren’t ) doctors. 11.These are not (aren’t ) desks. 12.Those are not (aren’t ) desks. 三、be 动词一般疑问句: be + 主语 + 其它.(构成方法:肯定句变为疑问句,将动词提前到主语前面,同时在末尾 + ”) 以上面的句子为例,把肯定变为一般疑问句. 1.—— Am I a doctor? 2.—— Are you a doctor? 3.——Is he a doctor? 4.——Is she a doctor?. 5.——Is it a cat? 6.——Is this a desk. 7.——Is that a desk 8.——Are we doctors? 9.——Are you doctors? 10.——Are they doctors? 11.——Are these desks? 12.——Are those desks/ 四、对动词一般疑问句的两种回答 肯定形式:Yes,主语 + be (肯定回答不能缩写) 否定形式:No,主语 + be + not (能缩写的用缩写形式) 以上面的一般疑问句作出两种回答. 1、Yes,you are./ No,you aren’t. 2、Yes,I am ./ No ,I’m not . 3、Yes,he is,/ No,he isn’t. 4、Yes,she is./ No,she isn’t 5、Yes,it is./ No,it isn’t. 6、Yes,it is./ No,it isn’t. 7、Yes,it is./ No,it isn’t. 8、Yes,you are./ No,you aren’t. 9、Yes,we are./ No,we aren’t. 10、Yes,they are./ No,they aren’t. 11、Yes,they are./ No,they aren’t. 12、Yes,they are ./ No,they aren’t
1年前
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