三年级英语重点:一般现在时(Simple Present)详解
一、知识点讲解
1. 什么是一般现在时?
一般现在时(Simple Present Tense)是英语中最基本的时态,用来表示经常发生的动作、存在的状态、习惯或客观事实。
什么时候用一般现在时?
(1)经常性或习惯性的动作: - I get up at 7 o'clock every day.(我每天七点起床。) - She goes to school by bus.(她坐公交车上学。) - We play football on Sundays.(我们每周日踢足球。)
(2)客观事实或普遍真理: - The sun rises in the east.(太阳从东方升起。) - Water freezes at 0°C.(水在零度结冰。)
(3)目前的状态或特征: - I am a student.(我是一名学生。) - She has long hair.(她有长头发。) - He likes reading books.(他喜欢读书。)
2. 动词第三人称单数变化规则
当主语是 he/she/it 或单个人/物时,动词要变化:
| 规则 | 变化 | 例词 | 例句 |
|---|---|---|---|
| 一般动词 | 加 -s | play→plays, run→runs, read→reads | He plays football. |
| 以 s,x,sh,ch,o 结尾 | 加 -es | go→goes, watch→watches, wash→washes | She watches TV. |
| 辅音字母+y 结尾 | 变 y 为 i 加 -es | fly→flies, study→studies | He studies hard. |
| 元音字母+y 结尾 | 直接加 -s | play→plays, say→says | She plays piano. |
| have | 变为 has | have→has | She has a dog. |
| be | 变为 is | be→is | He is tall. |
3. 句型结构
一般现在时的三种基本句型:
| 句型 | 结构 | 例子 |
|---|---|---|
| 肯定句 | 主语 + 动词(第三人称单数加s/es) | I like apples. / She likes apples. |
| 否定句 | 主语 + don't/doesn't + 动词原形 | I don't like apples. / She doesn't like apples. |
| 一般疑问句 | Do/Does + 主语 + 动词原形? | Do you like apples? / Does she like apples? |
| 肯定回答 | Yes, 主语 + do/does | Yes, I do. / Yes, she does. |
| 否定回答 | No, 主语 + don't/doesn't | No, I don't. / No, she doesn't. |
否定句用法详解: - I/you/we/they 或复数名词时,用 don't + 动词原形。如:I don't like coffee. - he/she/it 或单数名词时,用 doesn't + 动词原形。如:She doesn't watch TV.
疑问句用法详解: - I/you/we/they 或复数名词,句首用 Do。如:Do you like apples? - he/she/it 或单数名词,句首用 Does。如:Does Tom like music?
4. 常用的时间状语
一般现在时常与以下时间状语连用:
| 时间状语 | 含义 | 例句 |
|---|---|---|
| every day | 每天 | I brush my teeth every day. |
| every week | 每周 | She visits her grandma every week. |
| every morning | 每天早上 | He reads English every morning. |
| on Sundays | 在每周日 | We go to the park on Sundays. |
| always | 总是 | She always gets up early. |
| usually | 通常 | I usually walk to school. |
| often | 经常 | They often play together. |
| sometimes | 有时 | He sometimes watches TV. |
| never | 从不 | She never eats junk food. |
| in the morning | 在早上 | I do exercise in the morning. |
| at night | 在晚上 | He reads books at night. |
二、典型例题
例题1:用所给词填空
(1) My father _____ (read) newspapers every morning. 答案:reads(主语第三人称单数 read 加 -s)。
(2) They _____ (go) to school by bus. 答案:go。主语 They 是复数,动词用原形。
(3) She _____ (have) a cute dog. 答案:has。have 的第三人称单数形式是特殊的 has。
(4) The cat _____ (like) fish very much. 答案:likes。The cat 是第三人称单数,like 加 -s。
(5) Mike _____ (study) English every day. 答案:studies。study 以辅音字母 y 结尾,变 y 为 i 加 -es。
(6) I _____ (do) my homework at 7 o'clock. 答案:do。主语 I 是第一人称单数,但动词用原形(只有第三称单数才需要变化)。
(7) The girl _____ (watch) TV after dinner. 答案:watches。watch 以 ch 结尾,加 -es。
(8) My parents _____ (work) in a hospital. 答案:work。主语 My parents 是复数,动词用原形。
例题2:改为否定句
(1) She watches TV in the evening. 否定句:She doesn't watch TV in the evening.(doesn't 后面动词回归原形)
(2) They go to school by bus. 否定句:They don't go to school by bus.
(3) He has breakfast at 7:00. 否定句:He doesn't have breakfast at 7:00.(has 回归原形 have)
例题3:改为一般疑问句并回答
(1) She reads books in the library. 疑问句:Does she read books in the library? 肯定回答:Yes, she does. 否定回答:No, she doesn't.
(2) They play football after school. 疑问句:Do they play football after school? 肯定回答:Yes, they do. 否定回答:No, they don't.
(3) Tom likes swimming. 疑问句:Does Tom like swimming? 肯定回答:Yes, he does. 否定回答:No, he doesn't.
例题4:根据问句选答句
(1) Do you like apples? A. Yes, I do. B. Yes, she does. 答案:A (2) Does Tom play football? A. Yes, he do. B. Yes, he does. 答案:B (3) Do they go to school? A. Yes, they do. B. Yes, he does. 答案:A (4) Does your mother like cooking? A. Yes, she does. B. Yes, she likes. 答案:A
三、常见误区
❌ 误区一:主语是第三人称单数时忘加 -s/-es。 错误:He like apples. 正确:He likes apples.
❌ 误区二:doesn't/Does 后面还加 -s/-es。 错误:She doesn't likes dogs. 正确:She doesn't like dogs. 记住:doesn't 本身已体现第三人称,后面动词用原形。
❌ 误区三:把 have 变成 haves。 错误:She haves a cat. 正确:She has a cat. have 的第三人称单数是特殊变化 has。
❌ 误区四:混淆 do 和 does 在疑问句中的用法。 错误:Does you like apples? 正确:Do you like apples? 主语 you/I/we/they 用 Do,he/she/it 用 Does。
❌ 误区五:go/do 忘加 -es。 错误:She go to school. 正确:She goes to school.
四、趣味练习
点击展开练习
### 圈出正确答案 1. Tom (like / likes) playing football. 2. My sister (go / goes) to school by bike. 3. The cat (have / has) two big eyes. 4. We (don't / doesn't) like rainy days. 5. (Do / Does) she read books every day? 6. Mike (study / studies) in the library.查看答案
1. likes(Tom 是第三人称单数) 2. goes(My sister 是第三人称单数) 3. has(have 的特殊变化) 4. don't(We 是复数) 5. Does(she 是第三人称单数) 6. studies(Mike 是第三人称单数,study 变 y 为 i 加 -es)查看答案
1. Does she get up at six every day? 2. I don't like getting up early. 3. He always has breakfast at seven. 4. Do they go to school by bus?查看答案
1. go -> goes(He 是第三人称单数) 2. don't -> doesn't(She 是第三人称单数) 3. Does -> Do(they 是复数) 4. likes -> like(I 不是第三人称单数)五、课后作业
基础题
- 写出下列动词的第三人称单数形式: play → _ watch → study → have → _ go → do → wash → _ fly → ___
- 用所给动词的正确形式填空: (1) The boy _ (draw) a picture every weekend. (2) My parents (work) in a hospital. (3) She (wash) her face every morning. (4) The dog _ (run) very fast. (5) We (have) lunch at school. (6) He (go) to bed at 9 o'clock.
提高题
- 把下面的句子改为否定句和一般疑问句: (1) She reads books in the library. (2) They play football after school. (3) Mike goes to school by bike.
- 用一般现在时写 3 个关于你日常生活的句子,用上 every day、always、sometimes。
挑战题
- 下面这段话中有 5 个错误,请找出来并改正: "Mike get up at 7:00. He have breakfast at 7:30. Then he go to school by bus. His mother go to work. They doesn't like to be late."
- 写一段短文(至少 5 句),描述 Mike 每天的生活,用一般现在时。
- 选词填空:(1) Do/Does your father like sports? (2) My brother don't/doesn't eat meat. (3) Do/Does the children play? (4) She study/studies hard.