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寒假预习:专题08 Unit 4 Plant life语法讲义+知识演练2025-2026学年四年级下册英语(外研版)
核心语法点1:现在进行时—— 询问/描述正在进行的种植相关动作
1. 语法含义:表示此时此刻正在进行、发生的动作。
2. 关键规则:主语 + be动词(am/is/are)+ 动词-ing形式(动词原形加-ing);否定句在be动词后加not,一般疑问句将be动词提前。
3. 课本原句例句:
— What are you doing? (你正在做什么?)
— We're digging. (我们正在挖洞。)
— Are your seeds growing? (你的种子在生长吗?)
— Yes, they are. (是的,它们在生长。)
— They're planting tomato seeds. (他们正在种西红柿种子。)
4. 易错提醒:be动词与主语一致(I用am,you用are,he/she/it/三单名词用is);dig→digging、plant→planting,动词-ing形式拼写无误。
核心语法点2:一般现在时—— 描述日常动作、植物生长规律或长期状态
1. 语法含义:表示经常性、习惯性的动作,或植物生长的规律、某人的长期状态(如爷爷经常在田里工作)。
2. 关键规则:主语是第三人称单数(he/she/it/单数名词)时,动词加-s/-es;主语是复数/第一人称(I/we/you/they)时,动词用原形。
3. 课本原句例句:
— Grandpa often works in the fields. (爷爷经常在田里工作。)(Grandpa是三单,work→works)
— The sunflower grows tall and strong. (向日葵长得又高又壮。)(sunflower是三单,grow→grows)
— The seed grows into a small plant. (种子长成一棵小植物。)(seed是三单,grow→grows)
核心语法点3:情态动词will 的用法—— 描述将来会发生的动作或愿望
1. 语法含义:表示“将、会”,用于描述未来植物的生长变化,或某人的愿望、梦想(如爷爷的梦想)。
2. 关键规则:will 后面永远接动词原形;否定句在will后加not(缩写为won't),一般疑问句将will提前。
3. 课本原句例句:
— He will grow tall rice plants. (他想种/将会种高大的水稻。)(grow用原形)
— The seed will grow into a big tree. (这颗种子将会长成一棵大树。)(grow用原形)
— I think his dreams will come true. (我认为他的梦想将会实现。)(come用原形)
核心语法点4:名词单复数—— 描述植物的组成部分
1. 语法含义:本单元重点考查植物部位相关名词的单复数变化,用于描述多棵植物或植物的多个部位。
2. 关键规则:大部分名词变复数加-s;以f/fe结尾的名词变复数,变f/fe为v再加-es(如leaf→leaves);不规则变化(如mouse→mice)。
3. 课本原句例句:
—— Look at my roots. (看我的根。)(root→roots,加-s)
—— My leaves are green. (我的叶子是绿色的。)(leaf→leaves,以f结尾,变f为v再加-es,规则变化)
— I've got a mouse. (我有一只老鼠。)
→ They've got two mice. (他们有两只老鼠。)(mouse→mice)
核心语法点5:一般疑问句—— 询问植物生长情况或动作
1. 语法含义:本单元重点考查be动词(am/is/are)和助动词(do/does)引导的一般疑问句,用于询问种子生长、他人动作等。
2. 关键规则:be动词引导的疑问句,用be动词回答;do/does引导的疑问句,用do/does回答,动词用原形。
3. 课本原句例句:
— Are your seeds growing? (你的种子在生长吗?)
— Yes, they are. / No, they aren't.
— Does Grandpa often work in the fields? (爷爷经常在田里工作吗?
— Yes, he does. / No, he doesn't.
知识演练
一、语法填空
1. What are you doing? I __________ (dig) holes now.(你正在做什么?我现在正在挖洞。)
2. Grandpa often __________ (work) in the fields. He loves rice plants.(爷爷经常在田里工作,他喜欢水稻。)
3. The seed __________ (grow) into a small plant soon.(这颗种子很快将会长成一棵小植物。)
4. Look at the plant. Its __________ (leaf) are green and big.(看这棵植物,它的叶子又绿又大。)
5. They __________ (plant) tomato seeds now. They want to make a small garden.(他们现在正在种西红柿种子,他们想开辟一个小花园。)
二、单项选择
( )1. —What are you doing? —We __________ planting seeds.
A. am B. is C. are
( )2. Grandpa __________ works in the fields. He is very hard-working.
A. often B. now C. tomorrow
( )3. The seed __________ grow into a sunflower. I believe it.
A. will B. is C. does
( )4. —Are your __________ growing? —Yes, they are. They are long and thin.
A. root B. roots C. leaf
( )5. —Does she __________ the flowers every morning? —Yes, she does.
A. water B. waters C. watering
三、句型转换(每空一词)
1. We're digging holes.(改为一般疑问句并作肯定回答)
— __________ you digging holes? — Yes, __________ __________.
2. Grandpa often works in the fields.(改为否定句)
— Grandpa __________ often __________ in the fields.
3. The seed will grow into a big tree.(改为否定句)
— The seed __________ __________ into a big tree.
4. He is watering the wheat.(对划线部分提问)
— __________ __________ he doing?
5. Her leaves are green.(改为一般疑问句并作否定回答)
— __________ her leaves green? — No, __________ __________.
四、判断句子语法使用的正(T)误(F)
( )1. They are plant tomato seeds now.(他们现在正在种西红柿种子。)
( )2. Grandpa often works in the fields.(爷爷经常在田里工作。)
( )3. The seed will grows into a small plant.(这颗种子将会长成一棵小植物。)
( )4. Look at the roots. They are long.(看这些根,它们很长。)
( )5. Does he waters the flowers every day?(他每天都给花浇水吗?)
五、补全对话
1. —What __________ you doing? —I'm picking cotton.(—你正在做什么?—我正在摘棉花。)
2. —__________ your seeds growing? —Yes, they are.(—你的种子在生长吗?—是的,它们在生长。)
3. —What does Grandpa often do? —He often __________ in the fields.(—爷爷经常做什么?—他经常在田里工作。)
4. —Will the seed grow into a sunflower? —Yes, it __________.(—这颗种子将会长成向日葵吗?—是的,会的。)
5. —Look at the plant. Its __________ are green. —How lovely!(—看这棵植物,它的叶子是绿色的。—真可爱!)
六、语法匹配
( )1. We're digging holes. A. 一般现在时(三单)
( )2. Grandpa often works in the fields. B. 现在进行时
( )3. The seed will grow into a tree. C. 名词单复数
( )4. Its leaves are green. D. 情态动词will 的用法
( )5. Are your seeds growing? E. 一般疑问句(be动词引导)
七、连词成句
1. you, are, doing, what (?)
→ __________________________________________
2. grandpa, in, works, often, fields, the (.)
→ ___________________________________________
3. seed, the, will, a, into, grow, sunflower (.)
→ ___________________________________________
4. are, they, seeds, planting, tomato (.)
→ ___________________________________________
5. leaves, green, are, its (.)
→ ___________________________________________
答案
一、1. am digging 2. works 3. will grow 4. leaves 5. are planting
二、1. C 2. A 3. A 4. B 5. A
三、1. Are; we are 2. doesn't; work 3. won't grow 4. What is 5. Are; they aren't
四、1. F 2. T 3. F 4. T 5. F
五、1. are 2. Are 3. works 4. will 5. leaves
六、1.B 2.A 3.D 4.C 5.E
七、1. What are you doing?
2. Grandpa often works in the fields.
3. The seed will grow into a sunflower.
4. They are planting tomato seeds.
5. Its leaves are green.
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