将来时态的被动语态 (2)

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Passive voice,allow,的用法：,1),allow,sb,.,sth,.,允许某人某事；,2),sb,.,in(out,),允许进入（出去）,;,3),allow,sb,.to do,sth,.,允许某人做某事,4)doing,sth,.,允许干某事。,注：不说,allow to do,类似的动词短语还有：,advise,sb,.to do /advise doing,sth,.,permit,sb,.to do/permit doing,sth,.,encourage,鼓励,/,forbid,禁止,不许在候车室吸烟。,We dont allow smoking in the waiting room.,Smoking is not allowed in the waiting room.,We do not allow passengers to smoke in the waiting room.,Passengers are not allowed to smoke in the waiting room.,Smoking is not allowed in non-smoking areas.,Smoking is not allowed in hospitals and schools.,Smoking will not be allowed in any public places.,Smoking will be allowed only in smoking areas.,dirty water,Dirty water will not be allowed to go into rivers before it is made clean.,Dirty water must be made clean before it,goes,into rivers.,pollute air,Air is being polluted.,Air will be polluted.,Polluted air cant,go,into the air before it is made clean.,trees cut down,More trees will be cut down.,Few trees,will be left.,Forests,will be disappearing.,classroom,crowd,Our classroom will be more crowded.,Our classroom will be less crowded.,Population will keep increasing and classrooms and hospitals will be crowded.,too many cars,There will be too many cars in the streets.,The streets,More harmful gases,Air,When fossil fuels are burnt,carbon dioxide will into the air,which will,bring,about a lot of environmental problems.,So,carbon emission,will be sent into the air.,will be polluted more seriously.,will be too crowded.,be sent,must be cut.,What will be done to make the city more beautiful and attractive?,will(not)be done,pollution;control/stop,Pollutions must be controlled.,Pollution cannot be controlled unless every one of us makes efforts to do something.,unless everyone realizes how serious the problem is,and does something to stop,it.,streets,widen,more trees;plant,build,set up,increase/develop,decrease,/reduce,We will make efforts to make our city more beautiful and attractive.,Pollution,Waste water and waste gases,More trees,More schools and hospitals,Public transport,Our city will look more beautiful and,better,to live in.,must be controlled.,must be made clean before they are sent out.,will be planted to make the city a green city,.,will be set up.,will be developed.,