You must prevent them from ____(吐唾沫) in public.

as相当于when,此处省略了be,即when he is lack of money .很简单嘛

stop sb from doing sth
有不会的可以再问我

1.根据牛津高阶,都不要去掉FROM是最好的,但是里面也说了,在英式英语中,可以用stop doing sth..不过实际上啊,都可以去掉,因为prevent,stop都有阻止的意思了,我做英语练习题时都有遇到过.PS：keep sb./sth.from doing sth.表示“阻止某人/某物做某事”时,from绝对不可以去掉!
如果去掉就成了“让某人/某物一直做某事”了.
3.at home ,from home 不知道了……
4.be harmful to …… 你的介词用错了,这是一个固定搭配,记住就好了.
5.可数兼不可数,当service表示公共事业机构、网球中的发球、高速公路上的服务站、整套餐具、宗教礼拜……时,可数.
不可数的情况也很多,查字典吧,因为和可数时意思很接近的情况有很多,我就不列出来,我不想表达错误误导你,去翻牛津词典,好多分类.
6.现在完成时和一般过去式的区别在于,前者强调这个过程,后者只表示结果.
这里用现在完成时是想强调 钥匙在这里放了“一整个上午”,如果用一般过去时就很难把“一整个上午”给突出强调出来了.
7.He no longer lives here.
She likes him no more.
《高中英语短语大全》里说：no more多用来修饰具体动作； no longer多用来修饰某种状态.我是没怎么领会到它的意思,就……仅供参考,可以忽略.
8.in/at/around…… the place 看情境,有很多介词可以用啊~
希望可以帮到你.

15世纪早期进入英语,直接源自拉丁语的prventus.【词形变化】形容词:preventable 名词:preventability
动词过去式:prevented 动词过去分词:prevented
动词现在分词:preventing 动词第三人称单数:prevents
【词义辨析】block,bar,hinder,obstruct,prevent,hamper
这些动词均含有“阻止、阻塞”之意.
block:语气强烈,指有效堵住了通道,使人或物无法通过.
bar:含义与block很接近,指阻塞通道或禁止出入,但有暗示不用障碍物的阻止或禁止.
hinder:语气较轻,多指阻碍、拖延人或事,强调使进展速度缓慢下来.
obstruct:正式用词,语气强,多指以干扰或设置障碍的方式阻碍交通,使不能自由畅通.
prevent:含义广泛,指采取预防措施或设置障碍去阻止某人或某事.
hamper:侧重因受到约束或阻碍而造成的行动困难.【语法用法】1.prevent指“阻止成功”,如果阻止了,但是没有成功,不可用prevent.如果说她阻止他去,实际上他的确没有去,可以说She prevented him from going.但是他不听劝,还是去的话,要说She tried to prevent him from going,but he still went；
2.prevent加宾语时,宾语后不可接不定式.
She prevented him to go.
该句是错误的表达.
错句举例与错句分析：
错句:He prevented the boy to climb the tree.
订正:He prevented the boy from climbing the tree.
翻译:他阻止那个小男孩爬树.
分析:prevent一般常与动名词搭配,后不接不定式,如prevent...from.关于月饼的那些事儿 电音双人组Nero称霸英国单曲榜 2011情侣卫衣125元/套 世界最高的“摩天轮”
例句用法|同义词|反义词|短语词组|邻近词语|查看全部例句与词语
【例句用法】
1.What can we do to prevent the disease spreading?
我们能做什么来防止这种疾病蔓延呢?
2.These regulations are intended to prevent accidents.
这些规章制度旨在防止事故发生.
3.Strove to prevent our courage from turning into bravado.
努力预防我们的勇气变成一种虚张声势
4.They painted a coat of paint to prevent the oxidation of the ship by seawater.
他们刷了一层油漆以防止船只被海水氧化.
5.The policy is designed to prevent the predominance of one group over another.
该政策旨在防止一些人压制另一些人.
【同义词】
preclude vt.阻止,排除 stop v.停止,阻止,停留...
thwart v.反对,阻碍 ; n...inhibit v.抑制,阻止,使不能
block n.街区,木块,石块...avert vt.转开,避免,防止
avoid vt.避免,逃避,[...foil n.钝头剑,箔,陪衬...
check v.检查,阻止,核对...put a stop to 制止,使停止
nip in the bud 消灭于萌芽状态,刚开始...counteract v.抵制,清除,中和...
ward off 防止,避开 forbid vt.禁止,阻止,不许
deter vt.阻止,威慑,威吓 hinder v.阻碍,打扰 ; a...
prohibit vt.禁止,妨碍 bar n.酒吧,条,横木,...
keep v.保持,保留,继续...silence n.沉默,寂静 ; v...
help v.帮助,有助于,擅...discourage vt.阻碍,使气馁
abort v.流产,堕胎,中止 from prep.出自,来自,...
Keep from 阻止,妨碍 forestall v.领先,占先一步,...
stem n.柄,茎,干,船...obstruct v.阻隔,妨碍,阻塞
foreclose v.取消抵押品的赎回权,...hamper vt.妨碍,阻止 ; ...
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【反义词】
let vt.让,允许,使,...permit n.许可证,执照 ; ...
【短语词组】
prevent from 阻止,防止,使不 A stumble may pre...小惩大戒
【邻近词语】
prevaricate v.支吾其辞,搪塞 preven preventive 预防性的
prevarication n.支吾,推诿,搪塞 prevenance n.(对他人需求等的)...
prevaricator n.说话支吾的人,说...Prevenar n.沛儿
prevenience 预料,预期 prevenception 节育
prevenient adj.先前的,预期的 Prevendar 普雷文达尔
prevent from 阻止,防止,使不 Prevenici 普雷韦尼奇
preventable adj.可防止的,可预防的 prevent changes 防止修改
preventative adj.预防性的 ; n...prevent crimes 防止犯罪
prevent v.预防,防止 prevent defense 保护性防守
preventer n.妨碍者,阻扰者,...Prevent Diverting...请尽可能避免改道转递(电...
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“赘肉”美语怎么说?小笨霖英语笔记 美剧独白听写《绝望主妇》 NHK新闻一听就会
动词 prevent :
1.keep from happening or arising; make impossible
同义词:forestall,foreclose,preclude,forbid
2.stop (someone or something) from doing something or being in a certain state
同义词:keep

Education does help to a certain extent on the matter.It can explain to people about the risks involved and how to avoid it from happening.But more importantly,it also depends on the nature of the person.At the moment,in Africa,many people know about AIDS,yet they are reluctant to resort to a condom or contraceptives to prevent the spread of STD and AIDS.

prevent
及物动词,可是直接带宾语,表示阻止,禁止做某事；
还有就是prevent (...)from doing sth也是阻止,妨碍做某事,这个用法和stop类似,可是划等号
prevent from doing something.
阻止某人做某事

public
luckest
especially
actor
daily
printed
lend
to chat
including
off

主语We （动作的执行者）
谓语 prevent （表示一个动作）
宾语 him （动作的承受者）
宾语补足语 from playing football （补充说明宾语）
地点状语 in the street（说明 动作发生的地点）
希望对你有帮助

Measures should be taken to prevent paper mills from polluting the river~

it is said that something —must be done———to prevent the river from being polluted...
据说为了保护河流远离污染要做些什么
something是被做 所以用被动
如还有疑问,欢迎可以进入乐知各级别英语外教课免费旁听.
希望能帮到您

如果用於口语,那麼就用stop doing sth 来表达
stop him telling the truth.

health是名词；healthy是形容词.后加名词health

flood 洪水

阻止某人做某事

是介词,加名词或动名词.

we should prevent the earth from being polluted.我们要防止地球被污染.

We should prevent the children from approaching the fire

意思上相近但不同,第一个使摆脱使自由,第二个get rid of是主动地摆脱,第三个是阻止……

1. Applying menthol balm to temples can prevent one from being sleepy.
注：风油精还可以写成：mosquito repellent oil
2. It sounds good/nice/great. 或 Sounds good/nice/great.(只用于口语)

两个都可以.
prevent sb./sth.(from) doing sth.
stop sb./sth.(from) doing sth.
keep sb./sth.from doing sth.
这些都可以表示阻止某人做某事,但是keep sb/sth from doing sth 中from 不可以省略,否则就表示让某人一直做某事
还有,短语的省略是不会影响语态的,这是一个英语常识

C,景天科酸代谢,简称CAM.它们的绿色组织上的气孔夜间开放,吸收并固定CO2,形成以苹果酸为主的有机酸；白天则气孔,不吸收CO2,但同时却通过光合碳循环将从苹果酸中释放的CO2还原为糖.这种代谢方式首先在景天科植物中被发现,从而得名.以后在干旱地区的许多其他植物种类中也相继被发现.

1.Prevent sb (from) doing 阻止（防御）...做...,这里的from,绝对不能用to do代替
2.Protect sb from sth. （保护）使……免于,这里的from不能省,绝对不能用to do代替
3.如果要用doing的话,与其搭配的应该是介词against：
如 Protect sb against doing 防御……不做……
此外,stop sb (from) doing sth
stop sb to do sth

主语是执行动作的一方,谓语是那个动作,宾语是被执行动作的人.
翻译：我们阻止他在街上踢足球.
主语：we
谓语：prevent
宾语：him
地点状语：in the street
阻止某人做某事：prevent sb from doing sth

D

D的意思是以上所有答案都是正确的,并不能说明AB不行啊,亲,好好看看

usefulness
gentleness
sadness
prevention
collection
sickness
gladness

答案：【D pollution 】污染
我们必须尝试着防止污染
pollution不可数名词
【很荣幸能帮你解答这道题】
【你的10分满意,我们团队的无限动力】

A defect of vision prevented him from focusing accurately.
视力上的缺陷使他不能准确对焦
To restrict or prevent from free action or expression.
限制或防止…自由行动或表述

The average weather temperature are getting higher nowadays.We can feel that it is warmer at the same period of year. As far as I concerned, everyone should do something to help protect the environment. We should plant more trees and not litter anywhere. We should walk as much as possible if we are a car user.What's more, we need to teach our own guys to do like this.In all, we should help to pretend the global warming in our daily life,just by doing some very small things.
这位兄弟只有二级的,这样的应该可以了,平常做枪手的短文大概也这样.哈哈.

Headache arrives unnoticed and ultimately departs and you forget everything,the causes of its arrival!You have never tried to analyze,why you are repeatedly having the bouts of headache.Preventing hea...

我们应该竭尽全力防止在实验室发生任何事故.

做事不畏难,自无难人事.
大海不怕雨水多,好汉不怕困难多.
在人生的道路上,谁都会遇到困难和挫折,就看你能不能战胜它.

get away from/benifit(profit --from)/die from/differ from/be away from/release from----/tell---from---/know---from---/

e done happening
前面something和do之间是被动关系 所以要用be done
后面是prevent sth from doing

这是道填空么?高中英语还有填空的形式?还是楼主少打了什么捏?有需要解答什么呢?
如果是填空可以这样填：Every means ▁was used (by us)to▁▁▁▁▁ prevent the land from being polluted.
这里 means当方式方法讲,prevent…from 固定搭配,译为 防止… to表目的
本句译为 为防止大地被污染,(我们)用了各种方法.

A为正确答案.prevent sb from doing sth 阻止某人做某事；shoot at 朝、、、开枪.

倒装句.
用否定词nor引导的动词倒装（即部分倒装）,这种情况把情态动词或者形式动词（do,did之类的）提前到主语之前,为的是强调动作,在这里是强调阻止进一步的进步这个行为不可能,也就是说否定的是动作,而不是主语或者宾语什么的.

This 主语would prevent 谓语U 宾语from the infection of bacteria状语.
I 主语would ask 谓语my superior 宾语for instructions状语.
We 主语should make 谓语the play 宾语attractive宾语补足语 for the audiences状语.

the price of house would be prevented from rising
请在客户端右上角评价点“满意”即可

ealizing
especially
successed
如果有帮到您 如果还有问题 请重新提问哦

strict laws should be made to punish those drunken drivers
driver school should teach drivers how to drive safely and tell drivers the terrible influence on those drunk driving accidents

take的过去分词是taken而不是took.这里是be+过去分词表示被动语态.

lowing

1.We should prevent the environment from being polluted.
2.I won't forgive you unless you make your apology to me.
3.This city needs to depend on tourism.
4.Whether you will make progress in this mid-term examination will all depend in your efforts.
5.If possible,I want to avoid the rush hour.

应该填to live,表目的的一定要用不定式.to live a happy life是目的.
是不是有几个单词写错了啊?应该是tht 是the ；spread 是spreading ；lift是 life吧?

do you imagine是插入语,做题时把他去掉,再看,很明显了.

prevent sb.from doing sth.阻止某人干某事
study [ˈstʌdi]
v./ n.学习；调查,研究(成果)；书房
这里This prevent a stranger from studying you 应该是 这个可以防止陌生人调查你.
Being safe at school and in your everyday life needs knowledge .
要想在学校里面以及平时的日常生活中都能保证安全,这需要学习相关的知识.

1 No one can prevent the project from coming true (或from being realized).
2Do you admit that it was you who had broken the window.

the heavy rain prevented us from going on the match