must+have+down
答：人做主语，不一定都用主动语态的啊 人主动砍树，现在对环境造成很大伤害，要让这些人停下来不再砍树，不就是被动语态吗？所以选B 句意：今天森林差不多都没有了。人们必须要停下来不允许再砍树了。
答：D. be stopped from cutting 必须被阻止再砍树，就是停下。stop to do停下手头事，干另一件，stop doing停下正在干的。
答：5. might (不能用 may) have done 表示“过去本可以做某事却未做。” 注意：其否定形式 might not have done 没有虚拟语气的用法，might not have done 只能表推测，相当于 may not have done，意为：“过去可能没有做某事。”二、表推测的用法 1. must have done 表示对过去某事的肯定猜测，...
答：事实上：must － ① certain something is true； ② strong obligation have to － usually means that some external circumstance makes the obligation necessary.have to 比must的语气缓和多了，有“情非得已”或“身不由己”的含义。 －－ 这句前面，已经用了I am sorry， 这种语气已经暗示了...
答：答案： B stop doing sth. 停止做某事 翻译： 现如今森林几乎消失，人们必须停止砍伐太多的树木 而： stop sb. from doing 阻止某人做某事
答：n.〈口〉有产者，有钱人;富国;〈英俚〉欺骗，诈骗 例句：A country must have the will to repel any invader.一个国家得有决心击退任何入侵者。The police have absolute proof of his guilt.警方有他犯罪的确凿证据。Have a glass of beer to rinse your dinner down.喝杯啤酒把你吃的晚饭冲...
答：Tree after tree went own , cut down by the water , which must have been three metres deep 一棵又一棵的树被水冲倒、冲断。那水肯定有三米深。Tree after tree went down , cut down by the water , which must have been three metres deep 洪水想必深达三米，树一棵接一棵地...
答：must not do 不可以(用于一般现在时)。虚拟语气经典习题1. If I had had enough time, I my work. A. would finish B. must have finished C. would have finished D. had finished 2. Ten minutes earlier, they the plane. A. will catch B. would catch C. would have caught D. will ...
答：But some even managed to keep their jobs: While Citi and BofA have shaken up their boards, 13 pre-bailout directors remain at the two banks. Vikram Pandit continues as CEO of Citi, while Ken Lewis only recently stepped down as CEO of Bank of America. Consider too the modest toll paid ...
答：You have got to put the past behind you before you can move on. 放下包袱,继续前进。 Shit happens! 不好的事情发生了。 It was like just before the sun goes to bed down on the bayou. There was a million sparkles on the river. 就像太阳在落山前映射在河口上,有无数的亮点在闪闪发光...
网友评论：
薛侨17227156021：
情态动词+have down是什么 -
45745石畏
： 虚拟语气 eg:you should have finished the work last week. 你本应该在上周完成这项工作的. 意思是你本应该完成(做了)什么,但是你没有做.
薛侨17227156021：
must的用法 -
45745石畏
： 1、表示“必须”此时可用于肯定句、否定句或疑问句,用于否定句时,mustn't的意思是“一定不要”“不能”,而不表示“不必”.must主要表示现在或将来,但在间接引语中也可表过去(=hadto).对于must开头的一般疑问句,若作否定回答,可以用needn't,不用mustn't2、表示推测意为“准是”“一定是”,通常只用于肯定句.若用于否定句或疑问句,则用can代之.若要谈论过去的情况,必须用“must+have+过去分词”3、表示“偏偏”有时must可表示某事发生得不早不迟,就在某个当紧的时候,多指某些不受欢迎的事情的发生.有时还可指主观上的偏执或固执,常可译为“偏”“偏要”.
薛侨17227156021：
must be的用法 -
45745石畏
： “must+be”“must+be+ v -ing”“must+表示状态的动词”可表示现在或一般的情况;“must+have”表示过去的情况;“must+表示动作的动词”表示将来的情况. must的英式读法是[mʌst];美式读法是[mʌst]. 单词直接源自古英语的moste...
薛侨17227156021：
must have done的反义疑问句must have down的反义疑问句应该用什么?don't,didn't,hasn't,haven't说什么的都有,好像还牵扯虚拟语气请高人给一个系统的... -
45745石畏
：[答案] 情态动词+动词完成时,即情态动词+have+done.表示对过去的行为或动作进行推测,评论或者判断. 1.must have done. 表示对过去某事的肯定猜测,其否定或疑问形式都用can/could来表示. 例如:since the road is wet,it must have rained last night. 2;...
薛侨17227156021：
must have donemust have done 的用法详细说明.可以归结为虚拟语气里面的么?must have been down 是must have down 的被动语态么 -
45745石畏
：[答案] Must have done 表对过去的推测. Must have been done 表对过去的被动推测. 例句,She must have loved deeply,so she was so hurt.她一定曾经爱的深,才会如此受伤. She must have been loved too,so she didn't have any regrets.她一定被爱过,所以...
薛侨17227156021：
should have done .would have done. must have done三者之间的意思和用法上有什么区别? -
45745石畏
： 1.should/ought to have done的含义. “should/ought to have+过去分词”表示“过去应该做谋事却没有做”; “should not/ought not to have+过去分词”表示“作了不应该做的事”.含有责备或遗憾的意思.例如: You shouldn't /oughtn't to ...
薛侨17227156021：
have to,must ,gotta的区别?用法! -
45745石畏
： 1. have to是表示不得不要,大多是因为客观方面的原因.例:i have to go because it's time for school now.2. must也是＂不得不＂的意思,但客观原因方面比较弱.3. gotta=have got to)必须,俚语,较不正式
薛侨17227156021：
must have caught和 must have got caught的区别 -
45745石畏
： 情态动词must+have done只用于肯定句中,表示对过去发生的事情或状态进行肯定的推测,意为”过去一定做过某事” must have caught 过去一定抓了... must have got caught=must have been caught. 过去一定被抓了
薛侨17227156021：
must的反义疑问句 是mustn't还是don't -
45745石畏
： 这个分情况哒,不用情况用不一样的~ 当陈述部分有情态动词must,问句有4种情况: (1)mustn't表示“禁止,不可,不必”时,附加问句通常要用must. You mustn't stop your car here,must you? 你不能把车停在这地方,知道吗? (2)must表...
薛侨17227156021：
非要做某事的英文是must to do 还是must do -
45745石畏
： 答案是:应该用must do,must是情态动词,情态动词后面的动词只能用动词原形. must do 英 [mʌst duː] 美 [mʌst duː]释义:必须做;必须;必做;非做不可的事情;要做 语法:表示义务或强制,含意是“必须”“应当”,其否定结构表示...
