一、核心知识点
1. 动词的分类
| 类别 | 说明 | 例词 |
|---|---|---|
| 实义动词 | 有实际意义，能独立作谓语 | run, eat, think, like |
| 系动词 | 连接主语和表语 | be, become, seem, look, feel |
| 助动词 | 帮助构成时态、语态、疑问句、否定句 | be, do, have, will |
| 情态动词 | 表示能力、许可、义务、推测等 | can, may, must, should, will |
2. 动词的基本形式
| 形式 | 构成 | 例词（以 work 为例） |
|---|---|---|
| 原形 | 词典中的形式 | work |
| 第三人称单数 | 原形 + s/es | works |
| 过去式 | 规则加 -ed / 不规则变化 | worked |
| 过去分词 | 规则加 -ed / 不规则变化 | worked |
| 现在分词 | 原形 + -ing | working |
3. 第三人称单数变化规则
| 规则 | 变化 | 例词 |
|---|---|---|
| 一般情况 | 加 -s | work → works, read → reads |
| 以 s/x/sh/ch/o 结尾 | 加 -es | go → goes, watch → watches, do → does |
| 以辅音 + y 结尾 | 变 y 为 i 加 -es | study → studies, fly → flies |
| 不规则 | 单独记忆 | have → has, be → is/am/are |
4. 常见情态动词
| 情态动词 | 含义 | 例句 |
|---|---|---|
| can | 能，会（能力）；可以（许可） | I can swim. / You can go now. |
| could | can 的过去式；更委婉的请求 | Could you help me? |
| may | 可以（许可）；也许（推测） | You may leave now. / It may rain. |
| might | may 的过去式；可能性更小 | It might be true. |
| must | 必须（义务）；一定（推测） | You must finish it. / He must be tired. |
| should | 应该（建议） | You should study harder. |
| will | 将要；愿意 | I will go tomorrow. |
| would | will 的过去式；委婉请求 | Would you like some tea? |
| need | 需要（作情态动词时用于否定/疑问） | You needn't worry. |
| had better | 最好 | You had better go now. |
情态动词特点： - 后接动词原形 - 无人称变化（第三人称不加 s） - 否定直接加 not - 疑问句将情态动词提前
二、重点语法规则
规则1：动词时态的基本构成
| 时态 | 构成 | 例句 |
|---|---|---|
| 一般现在时 | 原形 / 三单 | I work. / He works. |
| 一般过去时 | 过去式 | I worked. |
| 一般将来时 | will + 原形 / be going to + 原形 | I will work. / I am going to work. |
| 现在进行时 | am/is/are + doing | I am working. |
| 过去进行时 | was/were + doing | I was working. |
| 现在完成时 | have/has + 过去分词 | I have worked. |
| 过去完成时 | had + 过去分词 | I had worked. |
规则2：使役动词 have / make / let
| 使役动词 | 结构 | 例句 |
|---|---|---|
| have | have + sb. + do sth.（让某人做） | I had him clean the room. |
| make | make + sb. + do sth.（使某人做） | He made me laugh. |
| let | let + sb. + do sth.（让某人做） | Let me help you. |
注意：使役动词后接不带 to 的不定式（动词原形）。
规则3：感官动词 see / hear / watch / feel
| 结构 | 含义 | 例句 |
|---|---|---|
| see/hear + sb. do sth. | 看到/听到全过程 | I saw him cross the road. |
| see/hear + sb. doing sth. | 看到/听到正在做 | I saw him crossing the road. |
三、常见易错点
| 易错点 | 错误 | 正确 |
|---|---|---|
| 情态动词后接三单 | He can swims. | He can swim. |
| 使役动词后加 to | He made me to cry. | He made me cry. |
| there be 句型主谓一致 | There is some apples. | There are some apples. |
| 现在完成时与一般过去时混淆 | I have seen him yesterday. | I saw him yesterday. |
| 助动词 do 与 be 动词混淆 | Do you be happy? | Are you happy? |
四、典型例题分析
例题1：情态动词
题目：—______ I use your pen? —Sure, here you are. A. Must B. May C. Need
答案：B. May
解析：May I...? 是礼貌地请求许可，意为"我可以……吗？"。Must 表示必须，Need 表示需要，都不符合语境。
例题2：使役动词
题目：My mother often __ me ____ the dishes after dinner. A. makes; wash B. make; to wash C. makes; to wash
答案：A. makes; wash
解析：make 是使役动词，结构为 make + sb. + do sth.（动词原形），且主语是第三人称单数，make 要加 s。
例题3：感官动词
题目：I often hear her ______ in the next room. A. sing B. to sing C. singing
答案：A. sing（表示经常听到她唱歌的全过程）或 C. singing（表示听到她正在唱歌）
解析：hear sb. do sth. 表示听到全过程；hear sb. doing sth. 表示听到正在做。根据 often 判断是经常发生的动作，用 sing 更合适。
例题4：there be 句型
题目：There ______ a pen and two books on the desk. A. is B. are C. be
答案：A. is
解析：there be 句型遵循"就近原则"，即 be 动词的形式与最近的名词保持一致。a pen 是单数，所以用 is。
例题5：动词时态
题目：Look! The children ______ in the playground. A. play B. are playing C. played
答案：B. are playing
解析：Look! 是现在进行时的标志词，表示动作正在发生。现在进行时结构：am/is/are + doing。
五、速记口诀
动词三单变化口诀：
动词三单有规律，一般词尾加 s； s x sh ch o 结尾，加上 es 别忘记； 辅音 y 变 i 加 es，have 变 has 要牢记。
情态动词口诀：
情态动词后接原，没有人称和数变； 否定 not 后面跟，疑问提前记心间。
使役动词口诀：
have make let 是使役，后面动词用原形； see hear watch 感官动，do doing 两不同。