be动词、一般动词和助动词

be 动词、一般动词和助动词一、be 动词、一般动词的现在式（1）be 动词的现在式—am/are/isbe 动词的含义a.是（表状态）We are happy.—我们很兴奋b.在（表存在）She is in America.—她在美国主语+be 动词主语be 动词例句第一人称amI am a boy.第二人称areYou are my sons.第三人称的单数名词isHe is my student.be 动词的否定句含 be 动词（am/are/is）的肯定句变成否定句时，在 be 动词后加 not 即可。肯定句：主语+am/are/is…否定句：主语+am/are/is+not…He is a good baseball player.他是一个好棒球员（否定句）He is not a good baseball player.= He’s not a good baseball player.= He isn’t a good baseball player.be 动词的疑问句含 be 动词（am/are/is）的肯定句变成疑问句时，将 be 动词拿到主语前，句尾加？即可。肯定句：主语+am/are/is…疑问句：Am/Are/Is+主语…？1.That is his camera.那是他的相机（疑问句）Is that his camera?2.The girl is a junior high school student.那女孩是初中生（疑问句）Is the girl a junior high school student?Be 动词开头的疑问句为一般疑问句，可用 yes 或 no 回答，而答句中的主语用代名词（问句）Am/Are/Is+主语…？（答句）Yes,主语+am/are/is No,主语+am/are/is not1.Is that man your math teacher?Yes, he is./No,he is not.2.Are you eating your lunch?Yes, I am./No, I’m not.（2）一般动词的现在式一般动词的含义凡是日常生活中具体的动作，如：eat-吃饭，walk-走路与抽象的动作如：like-喜爱，think-思考…皆为一般动词主语+一般动词人称数单数复数第一人称I like dogs.We like dogs.第二人称You like dogs.You like dogs.第三人称He likes dogs.They like dogs.一般动词加 s 或 es 的方法a.大部分动词加 sworks/playsb.一般动词词尾为 o/s/sh/ch 时。加 esgo-goes/wash-washes/watch-watchesc.一般动词词尾为字音+y 时，去 y 加 iescry-cries/study-studies助动词 have 和 hashas 为 have（有，吃）的单数形式They have a lot of money.He has a lot of money.一般动词的否定句含有一般动词从肯定句变为否定句时，不可直接在一般动词之后加 not，必须使用助动词do/does/did。且助动词之后用原形动词，因为助动词表示...