仁爱英语（2024版）七年级下Unit 8 语法讲解与练习答案

仁爱英语（2024版）七年级下Unit8语法讲解与练习答案【语法点1】数词【点拨】一、大数的书写规则·三位分节法：从右至左每三位加逗号，单位依次为千（thousand）、百万（million）、十亿（billion）、万亿（trillion）。示例：1,000

→

onethousand10,000

→

tenthousand1,000,000

→

onemillion1,000,000,000

→

onebillion·逗号的作用：分隔位数，便于读写。例：45,390

→

forty-fivethousand,threehundredandninety93,000,000

→

ninety-threemillion二、大数的读法规则·逐节读法：按逗号分隔的单位依次读出。示例：6,363,000

→

sixmillion,threehundredandsixty-threethousand1,386,000,000

→

onebillion,threehundredandeighty-sixmillion909,090,009,900

→

ninehundredandninebillion,ninetymillion,ninethousand,ninehundred·特殊规则：百位与十位之间加

and（英式英语常见）。例：1,250

→

onethousandtwohundredandfifty千位后的逗号读作

thousand，百万位后读作

million，依此类推。三、基数词的用法·基本功能：表示具体数量，修饰可数或不可数名词。

例：threebooks（可数名词复数）fivebottlesofwater（不可数名词）·单复数规则：单位词（thousand,million等）前有具体数字时用单数形式。例：twothousandstudents（不加s）表示约数时用复数形式。例：thousandsofpeople（加s）【典例】一、填空题1.4,186

→

______thousand,______hundredandeighty-six.【答案】four;one2.45,390

→

forty-five______,threehundredand______.【答案】thousand;ninety3.1,386,000,000

→

onebillion,threehundredandeighty-six______.【答案】million4.909,090,009,900

→

ninehundredandnine______,ninety______,nine______,ninehundred.【答案】billion;million;thousand二、选择题1.

下列哪个数字读法正确？A.6,300

→

sixthousandandthreehundredB.93,000,000

→

ninety-threethousandC.1,000,000

→

onehundredthousand【答案】A2.

选择正确的读法：307,000,000A.threehundredsevenmillionB.threehundredandseventhousandC.thirty-sevenmillion【答案】A一、单词拼写1．Thereare

(hundred)ofbooksinourclassroom.【答案】hundreds2．Thereareovertwo

(thousand)studentsinthatschool.【答案】thousand3．Thereareovernine

(million)peopleinHefei.【答案】million4．Thereare

(hundred)ofpeopledancingatthesquareaftersupper.【答案】hundreds5．Inourschool,wehavemorethanthree

students.(千)【答案】thousand6．Look!Therearen

(十九)flowershere.Theyarenice.【答案】(n)ineteen7．Thereare

(thirty)daysinApril.【答案】thirty8．Thereare

(七)daysinaweek.【答案】seven9．Twoandsixis

(八).【答案】eight10．SheisinClass

(六),GradeSeven.【答案】Six【语法点2】祈使句【点拨】一、祈使句的定义与功能·定义：祈使句用于表达命令、请求、建议或劝告，通常省略主语（you），直接以动词原形开头。·功能：命令：Closethedoor.（关门。）请求：Pleasehelpme.（请帮我。）建议：Let’sgoforawalk.（我们去散步吧。）劝告：Don’tbelate.（别迟到。）二、祈使句的结构·肯定形式：动词原形

+

其他成分：Savewater.Let’s+

动词原形（建议）：Let’sprotecttheenvironment.·否定形式：Don’t+

动词原形：Don’twastetime.Never+

动词原形（语气更强）：Nevergiveup.（永不放弃）Let’snot+

动词原形：Let’snotargue.（让我们不要争论了。）No+

现在分词（表示禁止）：Nosmoking.（禁止吸烟）·礼貌表达：在句首或句尾加

please：Closethewindow,please.（请关上窗户。）三、考点与易错点·No+

现在分词：结构：No+

动词-ing（表示禁止某种行为）。错误示例：❌

Nosmoke.✅

Nosmoking.·常见搭配：Noparking.（禁止停车）Noswimming.（禁止游泳）·主语省略：祈使句的主语

you

必须省略。错误示例：❌

Youclosethedoor.✅

Closethedoor.·动词原形：祈使句必须以动词原形开头。错误示例：❌

Tosavewater.✅

Savewater.【典例】一、单项选择1.

选择正确的祈使句：A.Youclosethedoor.B.Closingthedoor.C.Closethedoor.【答案】C2.

选择正确的禁止标志：A.Noswim.B.Noswimming.C.Don’tswimming.【答案】B3.

选择正确的否定祈使句：A.Don’ttowastetime.B.Don’twastetime.C.Don’twastingtime.【答案】B二、适当形式填空1.

___________(save)water,saveourplanet!【答案】Save2.

_________________(notlitter)inthepark.【答案】Don’tlitter3.

______(禁止)parkinghereafter10PM.【答案】No4.

Let’s______(make)aposteraboutsavingenergy.【答案】make三、完成句子1.

Don’tforget_________________(turnoff)thelights.【答案】toturnoff2.

No_______________(smoke)inthisarea.【答案】smoking3.

Let’snot_____________(litter)

rubbisharound.【答案】litter四、句型转换1.改为祈使句：Youshouldclosethewindow._____________________________________【答案】Closethewindow.