Unit 5 Our Earth单元知识总结及重点易错（专项训练）-2026-2027学年重大版英语五年级上册

**基本信息** 聚焦五年级上册Unit 5核心语法与词汇，以十大易错考点为纲，通过分层训练系统构建语言应用能力与语法辨析思维。 **专项设计** |模块|题量/典例|方法提炼|知识逻辑| |----|-----------|----------|----------| |十大易错考点|9题/考点（基础+提升+拓展）|情态动词用法（should/must/can）、祈使句结构、名词单复数规则等核心语法规则提炼|从基础语法规则到情境应用，由词到句层层递进，覆盖单元重点与易错点|

重大版五年级上册 Unit 5 Our Earth 单元知识总结及重点易错专项分层训练 ■ ■ ■ ■ ■ ■ ■ 说明：本练习紧扣最新教材精选 10 个重点易错考点，每个考点含基础题×3、提升题×3、拓展题×3，共 90 题。 📖 一、重点单词（Words） ▶ 自然与地球：earth, world, sun, moon, star, sky, air, land, sea, ocean, mountain, river, forest, tree, plant, flower ▶ 环境与保护：environment, pollution, rubbish, waste, recycle, protect, save, clean, dirty, fresh ▶ 天气与气候：weather, climate, warm, hot, cool, cold, sunny, cloudy, windy, rainy, snowy ▶ 动作与行为：live, breathe, grow, plant, cut, pollute, recycle, reuse, reduce, save, protect ▶ 描述性形容词：beautiful, ugly, clean, dirty, fresh, polluted, important, necessary, different, same 📚 二、重点短语（Phrases） ● on the earth / in the world（在地球上/世界上） ● protect the environment（保护环境） ● keep...clean（保持……清洁） ● cut down trees（砍伐树木） ● plant trees（种树） ● pick up rubbish（捡垃圾） ● recycle waste paper（回收废纸） ● save water / save energy（节约用水/能源） ● reduce pollution（减少污染） ● be good for / be bad for（对……有益/有害） ● take care of the earth（爱护地球） ● make the air dirty / clean（使空气变脏/变干净） 💬 三、重点句型（Key Sentences） ★ We should / shouldn't + 动词原形 —— 我们应该/不应该…… ★ We must / mustn't + 动词原形 —— 我们必须/禁止…… ★ It is important to + 动词原形 —— 做某事很重要 ★ We can / can't + 动词原形 —— 我们能/不能…… ★ We should protect the earth because it is our home. —— 我们应该保护地球因为它是我们的家。 ★ Don't + 动词原形 —— 不要做某事（祈使句否定） 📝 四、重点语法（Grammar） ① 情态动词 should / shouldn't 表建议（后接动词原形） ② 情态动词 must / mustn't 表命令与禁止（后接动词原形） ③ 情态动词 can / can't 表能力与许可（后接动词原形） ④ 祈使句：肯定（动词原形开头）/ 否定（Don't + 动词原形） ⑤ 一般现在时：主语 + 动词原形/三单变化（描述习惯与事实） ⑥ because 引导原因状语从句 ⑦ too much + 不可数名词 / too many + 可数名词复数 ⑧ be good for / be bad for + 名词/动名词 ⑨ 连词 and / but / so / because 的用法辨析 ⑩ 名词单复数变化（tree→trees, box→boxes, baby→babies） 十大易错考点专项训练 （全部为单项选择题 · 基础3题 + 提升3题 + 拓展3题） 考点一：情态动词 should / shouldn't 表建议——后接动词原形，不随人称变化 【基础题】 ◇（ ）1. We _______ keep the earth clean. ( ) A. should B. shoulds C. shoulding D. to should ◇（ ）2. You _______ throw rubbish on the ground. ( ) A. should B. shouldn't C. shoulds D. to should ◇（ ）3. Olivia says we _______ plant more trees. ( ) A. should B. shoulds C. shoulded D. shoulding 【提升题】 ▷（ ）1. The teacher tells us we _______ waste water. ( ) A. should B. shouldn't C. shoulds D. must ▷（ ）2. Chen Wei thinks everyone _______ do something for the earth. ( ) A. should B. shoulds C. shoulded D. is should ▷（ ）3. They all agree we _______ protect the environment. ( ) A. should B. shoulds C. shoulded D. can 【拓展题】 ★（ ）1. —What should I do to help the earth? —You _______ recycle paper and plastic bottles. ( ) A. should B. shoulds C. shoulded D. are should ★（ ）2. The sign says we _______ walk on the grass in the park. ( ) A. should B. shouldn't C. shoulds D. shoulded ★（ ）3. Lily tells Bella they _______ use too many plastic bags. ( ) A. should B. shouldn't C. shoulds D. can 考点二：情态动词 must / mustn't 表命令与禁止——mustn't 表示"禁止"，语气最强 【基础题】 ◇（ ）1. We _______ obey the rules to protect nature. ( ) A. must B. musts C. musting D. to must ◇（ ）2. You _______ pollute the river. It is dangerous. ( ) A. must B. mustn't C. musts D. to must ◇（ ）3. Drivers _______ stop when the light is red. ( ) A. must B. musts C. musting D. can 【提升题】 ▷（ ）1. Students _______ eat in the science lab. ( ) A. must B. mustn't C. should D. can ▷（ ）2. In Xiamen, people _______ protect the coastline. ( ) A. must B. musts C. musting D. can ▷（ ）3. We _______ touch the machines in the factory. ( ) A. must B. mustn't C. should D. can 【拓展题】 ★（ ）1. —Must I turn off the lights when I leave? —Yes, you _______. ( ) A. must B. mustn't C. should D. can ★（ ）2. The teacher says we _______ be quiet in the library. ( ) A. must B. musts C. musting D. can ★（ ）3. Zhang Hao knows he _______ play near the deep river. ( ) A. must B. mustn't C. should D. can 考点三：情态动词 can / can't 表能力与许可——can 后接动词原形，否定 can't = cannot 【基础题】 ◇（ ）1. Birds _______ fly in the sky. ( ) A. can B. cans C. caning D. to can ◇（ ）2. Fish _______ walk on the land. ( ) A. can B. can't C. cans D. to can ◇（ ）3. _______ you help me pick up the rubbish? ( ) A. Can B. Cans C. Caning D. To can 【提升题】 ▷（ ）1. Olivia _______ speak English and Chinese. ( ) A. can B. cans C. caning D. to can ▷（ ）2. Jam _______ swim very fast in the sea. ( ) A. can B. cans C. caning D. to can ▷（ ）3. They _______ recycle paper at school. ( ) A. can B. cans C. caning D. to can 【拓展题】 ★（ ）1. —Can Lily ride a bike to school? —No, she _______. ( ) A. can B. can't C. cans D. caning ★（ ）2. Chen Wei thinks we _______ all do something for the earth. ( ) A. can B. cans C. caning D. to can ★（ ）3. In Kunming, people _______ see green mountains everywhere. ( ) A. can B. cans C. can't D. to can 考点四：祈使句——肯定（动词原形开头）/ 否定（Don't + 动词原形） 【基础题】 ◇（ ）1. _______ the earth clean and beautiful. ( ) A. Keep B. Keeps C. Keeping D. To keep ◇（ ）2. _______ throw rubbish on the ground. ( ) A. Don't B. Doesn't C. Not D. No ◇（ ）3. Please _______ down trees. ( ) A. not cut B. don't cut C. doesn't cut D. not cutting 【提升题】 ▷（ ）1. _______ the lights when you leave the room. ( ) A. Turn off B. Turns off C. Turning off D. To turn off ▷（ ）2. _______ waste water. It is precious. ( ) A. Don't B. Doesn't C. Not D. No ▷（ ）3. _______ the flowers in the park. ( ) A. Pick B. Picks C. Picking D. To pick 【拓展题】 ★（ ）1. _______ talking and listen to the teacher. ( ) A. Stop B. Stops C. Stopping D. To stop ★（ ）2. _______ use too many plastic bags. ( ) A. Don't B. Doesn't C. Not D. No ★（ ）3. Please _______ the air fresh for everyone. ( ) A. keep B. keeps C. keeping D. to keep 考点五：名词单复数变化规则——tree→trees, box→boxes, baby→babies, leaf→leaves, fish→fish 【基础题】 ◇（ ）1. There are many _______ in the forest. ( ) A. tree B. trees C. treees D. treen ◇（ ）2. We can see some _______ in the river. ( ) A. fish B. fishes C. fishs D. fishies ◇（ ）3. How many _______ are there on the table? ( ) A. box B. boxs C. boxes D. boxies 【提升题】 ▷（ ）1. The _______ are falling from the trees. ( ) A. leaf B. leafs C. leaves D. leafes ▷（ ）2. There are two _______ playing in the garden. ( ) A. baby B. babys C. babies D. babyes ▷（ ）3. We saw some _______ in the sky. ( ) A. star B. stars C. star D. starn 【拓展题】 ★（ ）1. The farmer has five _______ on his farm. ( ) A. sheep B. sheeps C. sheepes D. sheepn ★（ ）2. There are many _______ in the classroom. ( ) A. child B. childs C. children D. childen ★（ ）3. We need to plant more _______ to make the air clean. ( ) A. tree B. trees C. treees D. treen 考点六：because 引导原因状语从句——because 回答 why 的提问，不与 so 连用 【基础题】 ◇（ ）1. —Why should we plant trees? —_______ they can make the air clean. ( ) A. Because B. So C. And D. But ◇（ ）2. Lily is happy _______ she can help the earth. ( ) A. because B. so C. and D. but ◇（ ）3. We must save water _______ it is very important. ( ) A. because B. so C. and D. but 【提升题】 ▷（ ）1. Zhang Hao rides a bike to school _______ it is good for the earth. ( ) A. because B. so C. and D. but ▷（ ）2. —Why is the air dirty? —_______ there are too many cars. ( ) A. Because B. So C. And D. But ▷（ ）3. Olivia loves nature _______ she grew up in Kunming. ( ) A. because B. so C. and D. but 【拓展题】 ★（ ）1. We don't cut down trees _______ they help us breathe. ( ) A. because B. so C. and D. but ★（ ）2. —Why do they recycle paper? —_______ it can save trees. ( ) A. Because B. So C. And D. But ★（ ）3. Chen Wei is careful with rubbish _______ he wants a clean earth. ( ) A. because B. so C. and D. but 考点七：too much + 不可数名词 / too many + 可数名词复数——辨析 【基础题】 ◇（ ）1. There is too _______ pollution in the air. ( ) A. much B. many C. a lot D. lot of ◇（ ）2. There are too _______ cars on the road. ( ) A. much B. many C. a lot D. lot of ◇（ ）3. Don't waste too _______ water. ( ) A. much B. many C. a lot D. lot of 【提升题】 ▷（ ）1. We use too _______ plastic bags every day. ( ) A. much B. many C. a lot D. lot of ▷（ ）2. There is too _______ rubbish on the beach. ( ) A. much B. many C. a lot D. lot of ▷（ ）3. Too _______ people throw waste into the river. ( ) A. much B. many C. a lot D. lot of 【拓展题】 ★（ ）1. In Wuhan, too _______ factories make the air dirty. ( ) A. much B. many C. a lot D. lot of ★（ ）2. We should not drink too _______ soft drinks. ( ) A. much B. many C. a lot D. lot of ★（ ）3. Too _______ smoke comes from the chimneys. ( ) A. much B. many C. a lot D. lot of 考点八：be good for / be bad for + 名词/动名词——对……有益/有害 【基础题】 ◇（ ）1. Planting trees is good _______ the earth. ( ) A. for B. to C. at D. with ◇（ ）2. Too much pollution is bad _______ our health. ( ) A. for B. to C. at D. with ◇（ ）3. Recycling paper is good _______ the environment. ( ) A. for B. to C. at D. with 【提升题】 ▷（ ）1. Walking to school is good _______ your body. ( ) A. for B. to C. at D. with ▷（ ）2. Eating too much junk food is bad _______ you. ( ) A. for B. to C. at D. with ▷（ ）3. Saving water is good _______ the world. ( ) A. for B. to C. at D. with 【拓展题】 ★（ ）1. Riding a bike is good _______ the air in Jinan. ( ) A. for B. to C. at D. with ★（ ）2. Cutting down too many trees is bad _______ the animals. ( ) A. for B. to C. at D. with ★（ ）3. Using less plastic is good _______ the ocean. ( ) A. for B. to C. at D. with 考点九：连词 and / but / so / because 辨析——并列/转折/因果/原因 【基础题】 ◇（ ）1. We should plant trees, _______ we should also save water. ( ) A. and B. but C. so D. because ◇（ ）2. The air is dirty, _______ we must do something. ( ) A. and B. but C. so D. because ◇（ ）3. I like the earth, _______ I want to protect it. ( ) A. and B. but C. so D. because 【提升题】 ▷（ ）1. Lily loves nature, _______ her brother loves it too. ( ) A. and B. but C. so D. because ▷（ ）2. It is raining, _______ we can't go outside. ( ) A. and B. but C. so D. because ▷（ ）3. Zhang Hao is careful, _______ he still makes mistakes. ( ) A. and B. but C. so D. because 【拓展题】 ★（ ）1. The river is polluted, _______ the fish are dying. ( ) A. and B. but C. so D. because ★（ ）2. We must act now, _______ it will be too late. ( ) A. and B. but C. so D. or ★（ ）3. In Qingdao, the sea is beautiful, _______ some people still litter. ( ) A. and B. but C. so D. because 考点十：一般现在时第三人称单数动词变化——help→helps, watch→watches, study→studies, carry→carries 【基础题】 ◇（ ）1. Olivia _______ the earth every day. ( ) A. help B. helps C. helping D. to help ◇（ ）2. Jam _______ TV every evening. ( ) A. watch B. watches C. watching D. to watch ◇（ ）3. Bella _______ hard at school. ( ) A. study B. studys C. studies D. studying 【提升题】 ▷（ ）1. Chen Wei _______ his bike to school. ( ) A. ride B. rides C. riding D. to ride ▷（ ）2. Lily _______ the plants every morning. ( ) A. water B. waters C. watering D. to water ▷（ ）3. Zhang Hao _______ rubbish on the ground. ( ) A. not drop B. doesn't drop C. don't drop D. not drops 【拓展题】 ★（ ）1. Zhou Kai _______ his room every weekend. ( ) A. clean B. cleans C. cleaning D. to clean ★（ ）2. The factory _______ smoke into the air. ( ) A. not put B. doesn't put C. don't put D. not puts ★（ ）3. Everyone _______ to protect the earth. ( ) A. want B. wants C. wanting D. to want 参考答案与详细解析 考点一答案（should / shouldn't） ◇（ A ）1. A（should + 动词原形，不随人称变化） ◇（ B ）2. B（shouldn't 表示"不应该"） ◇（ A ）3. A（Olivia是第三人称单数，should不变） ▷（ B ）1. B（shouldn't waste 不应该浪费） ▷（ A ）2. A（should do something 应该做某事） ▷（ A ）3. A（should protect 应该保护） ★（ A ）1. A（should + 动词原形） ★（ B ）2. B（shouldn't 禁止践踏草坪） ★（ B ）3. B（shouldn't use 不应该使用太多塑料袋） 考点二答案（must / mustn't） ◇（ A ）1. A（must + 动词原形，表必须） ◇（ B ）2. B（mustn't 表禁止，不能污染河流） ◇（ A ）3. A（must stop 红灯必须停下） ▷（ B ）1. B（mustn't eat 禁止在实验室吃东西） ▷（ A ）2. A（must protect 必须保护海岸线） ▷（ B ）3. B（mustn't touch 禁止触碰机器） ★（ A ）1. A（Must I...? 肯定回答 Yes, you must.） ★（ A ）2. A（must be quiet 必须保持安静） ★（ B ）3. B（mustn't play 禁止在深水河边玩耍） 考点三答案（can / can't） ◇（ A ）1. A（can fly 能飞） ◇（ B ）2. B（can't walk 不能行走） ◇（ A ）3. A（Can you help...? 请求帮助） ▷（ A ）1. A（can speak 会说） ▷（ A ）2. A（can swim 能游泳） ▷（ A ）3. A（can recycle 能够回收） ★（ B ）1. B（can't 不能骑车，否定回答） ★（ A ）2. A（can all do 都能做） ★（ A ）3. A（can see 能看到） 考点四答案（祈使句） ◇（ A ）1. A（祈使句肯定，动词原形开头 Keep） ◇（ A ）2. A（Don't + 动词原形，否定祈使句） ◇（ B ）3. B（Don't cut = Please do not cut） ▷（ A ）1. A（Turn off 祈使句，关灯） ▷（ A ）2. A（Don't waste 不要浪费） ▷（ A ）3. A（Pick 祈使句肯定，摘花——注意此处为"摘花"的语法练习） ★（ A ）1. A（Stop talking 停止说话） ★（ A ）2. A（Don't use 不要使用） ★（ A ）3. A（keep 祈使句，保持空气清新） 考点五答案（名词单复数） ◇（ B ）1. B（many + 复数 trees） ◇（ A ）2. A（fish 单复数同形） ◇（ C ）3. C（box → boxes，以 x 结尾加 es） ▷（ C ）1. C（leaf → leaves，f 变 v 加 es） ▷（ C ）2. C（baby → babies，辅音+y 变 i 加 es） ▷（ B ）3. B（star → stars，直接加 s） ★（ A ）1. A（sheep 单复数同形） ★（ C ）2. C（child → children，不规则变化） ★（ B ）3. B（more + 复数 trees） 考点六答案（because 从句） ◇（ A ）1. A（because 回答 why 的提问） ◇（ A ）2. A（because 引导原因状语从句） ◇（ A ）3. A（because 引导原因） ▷（ A ）1. A（because 说明骑车的原因） ▷（ A ）2. A（because 回答 why） ▷（ A ）3. A（because 说明原因） ★（ A ）1. A（because 说明不砍树的原因） ★（ A ）2. A（because 回答 why） ★（ A ）3. A（because 说明原因） 考点七答案（too much / too many） ◇（ A ）1. A（pollution 不可数，用 much） ◇（ B ）2. B（cars 可数复数，用 many） ◇（ A ）3. A（water 不可数，用 much） ▷（ B ）1. B（plastic bags 可数复数，用 many） ▷（ A ）2. A（rubbish 不可数，用 much） ▷（ B ）3. B（people 此处为可数复数含义，用 many） ★（ B ）1. B（factories 可数复数，用 many） ★（ B ）2. B（soft drinks 可数复数，用 many） ★（ A ）3. A（smoke 不可数，用 much） 考点八答案（be good/bad for） ◇（ A ）1. A（be good for 对……有益） ◇（ A ）2. A（be bad for 对……有害） ◇（ A ）3. A（be good for 对……有益） ▷（ A ）1. A（be good for your body 对身体好） ▷（ A ）2. A（be bad for you 对你有害） ▷（ A ）3. A（be good for the world 对世界有益） ★（ A ）1. A（be good for the air 对空气好） ★（ A ）2. A（be bad for the animals 对动物有害） ★（ A ）3. A（be good for the ocean 对海洋有益） 考点九答案（and / but / so / because） ◇（ A ）1. A（and 并列两个应该做的事） ◇（ C ）2. C（so 因此，因果关系） ◇（ C ）3. C（so 因此，因果关系） ▷（ A ）1. A（and 并列，兄妹都喜欢自然） ▷（ C ）2. C（so 因此，不能外出） ▷（ B ）3. B（but 转折，虽然仔细但仍犯错） ★（ C ）1. C（so 因此，鱼在死亡） ★（ D ）2. D（or 否则，再不行动就太晚了） ★（ B ）3. B（but 转折，虽然美但仍有人乱扔） 考点十答案（三单变化） ◇（ B ）1. B（Olivia 三单，help → helps） ◇（ B ）2. B（Jam 三单，watch → watches） ◇（ C ）3. C（Bella 三单，study → studies） ▷（ B ）1. B（Chen Wei 三单，ride → rides） ▷（ B ）2. B（Lily 三单，water → waters） ▷（ B ）3. B（Zhang Hao 三单，doesn't drop） ★（ B ）1. B（Zhou Kai 三单，clean → cleans） ★（ B ）2. B（The factory 三单，doesn't put） ★（ B ）3. B（Everyone 三单，want → wants） 学科网（北京）股份有限公司 $