第四 Grammar单元语法精讲一、be动词的缩写形式1． be动词在某些名词、代询或副词之后，可以缩写成-’m，-’s，-’re，即I'm，she's，he's，it's，you' re。但是this is没有缩写形式，在肯定的简略答语中，一般也不用缩写形式。eg：She's a teacher．她是一个老师。2．is not和are not分别可以缩写成isn't和aren't，而am not没有缩写形式。另外am、is、are在句末时，也不能缩写。二、含有be动词的句型结构1．肯定句：主语+be+其他．2．否定句：主语+be+not+其他，即在be动词后加 not．3．一般疑问句：Be+主语十其他？即把be动词提到句子主语之前。肯定回答用“Yes，主语+be”，否定回答用“No, 主语+be+not”。三、be动词的形式be动词的一般现在时有am、is、are三种形式。am与第一人称单数(I)连用；is与第三人称单数( he/she/it)、指示代词单数或可数名词单数 连用；are与第二人称(you)、代词复数或可数名词复数连用。be动词用法歌诀I用am，You用are，is连接he，she，it单数名词用is，复数名词要用are。变疑问，往前提，句末问手莫丢弃。变否定，更容易, be后not莫忘记。疑问否定你变，句首大写莫迟疑。 一、单项选择1. —Is your new friend Diana from Shanghai?—______. She comes from Beijing. A. Yes, she is B. No, she isn'tC. Yes, she isn't D. No, she is2. —Jim and Jane. ______ brother and sister. —Yes. Their father ______ Mr Green. A. is, is B. are, are C. is, are D. are, is3. — ______ you good at swimming?—Yes. I think it ______ easy. A. Are, is B. Is, are C. Are, are D. Is, is4. —Mrs White is an American. Her eyes__________ blue. —Yes. And her golden(金色的) h |
