(
课件网) 动词be用法口诀 主语可以是代词，也可以是名词，动词be的单复数要与主语保持一致。 例：The little dog is so cute. The classmates are all friendly. 我（I）用 am, 你（you）用are, is 连接他/她/它（he/she/it）。 单数名词用is, 复数名词用are. 如果主语是人称代词，在非正式文体中，动词be与前面的主语可以缩写。 如：I am=I’m You are= You’re We are= We’re They are= They’re He is= He’s She is= She’s It is= It’s 一般现在时的概念： 一般现在时用来表示人或物的动作或状态 或表示主语现在具有的性格或能力等 用来表示人或物经常性或习惯性的动作或状态 表示人的喜好 表示真理，定理等 一般现在时的使用主要分为两种：be动词和行为动词！ 非三单 三单 the boy the boy Lily and I Lily and I the parent the parent the children the children the water the water I I you you 非三单口诀：I “复”you 三单口诀：不是I，不是you，不是复数，就是三单 Let's practice Unit 2 Hobbies 时 态 Simple present tense(II) 一般现在时助动词结构 Science changes people's lives. 主 谓 宾 判断时态要先看谓语动词， 动词原形或动词三单就是一般现在时 They change people's lives. 时间标志词：经常性、规律性 Daniel often visits science museums. 频率副词 always usually often sometimes seldom hardly never every ... once a week twice a month three times a year Simple present tense(II) 一般现在时助动词结构 结构 主语 + 谓语(具体的行为动作)+宾语，表示 “谁做什么”。 Daniel visits science museums. Science changes people's lives. Daniei likes to take things apart. visits changes likes 所以这类词叫做行为动词 助动词结构和be动词结构有什么不一样呢？ 助动词结构 She is a teacher. She isn’t a teacher. Is she a teacher What is her job Be动词结构转换其他句型，只需要加not或者调换位置。 肯定句 Science changes people's lives. 否定句 Science doesn’t change people's lives. 一般疑问句 Does science change people's live 特殊疑问句 What does science do 助动词结构 助动词结构转换成其他句型还要借助助动词，所以do/does叫做“助动词”，帮助句子构成否定句和疑问句。 肯定句 Science changes people's lives. 否定句 Science doesn’t change people's lives. They like sport. They don’t like sport. 否定句 肯定句 否定句 Tips 原句中没有be动词那就要用助动词。 Tips 谓语动词有s就用doesn’t, 没有就用don’t. 肯定句 Science changes people's lives. 一般疑问句 Does science change people's lives They like sport. Do they like sport 一般疑问句 肯定句 一般疑问句 Tips 谓语动词有s就用Does, 没有就用do. Yes, it does. /No, it doesn’t. Yes, they do. /No, they don’t. Tips 谓语动词有s就用Does, 没有就用do. 肯定句 Does science change people's lives 特殊疑问句 What does science change They like sport. What do they like 特殊疑问句 肯定句 特殊疑问句 Does No, she doesn’t. Does No, she doesn’t. Does No, he doesn’t. Do No, they don’t. 三单变化规则 以辅音+y结尾变y为i，再加es studies flies 以s, sh, ch, x结尾, 直接加es watches washes fixes dresses 以o结尾，直接加es goes does 除此之外，其他直接加es plays likes 无不规则变化 是不是和可数名词变复数有些相似？ 是的，没错！ loves reads plays watches goes flies dances wants like knows ... ...
