单元语法小专题(Grammar Focus)语法精讲具有情态动词的被动语态本 单 元 的 语 法 重 点 是 : 具 有 情 态 动 词 的 被 动 语 态 。 其 构 造 为 : 情 态 动 词(should，must，may，can，could 等)＋ be＋及物动词的过去分词。1.具有情态动词的被动语态的常见句式:(1)肯定句构造为:主语＋情态动词＋be＋及物动词的过去分词＋(by＋宾语).如:Your homework should be finished by yourself.你应当自己完毕作业。(2)否认句构造为:主语＋情态动词＋not＋be＋及物动词的过去分词＋(by＋宾语).如:The book can't be taken out of the reading room.这本书不能拿出阅览室。(3)一般疑问句构造为:情态动词＋主语＋be＋及物动词的过去分词＋(by＋宾语)?回答:Yes，主语＋情态动词./ No，主语＋情态动词＋not.如:—Should these young trees be watered every day？应当每天给这些小树浇水吗？—Yes，they should./ No，they shouldn't.对，应当。/不，不应当。(4)特殊疑问句构造为:疑问词＋一般疑问句？如:What should students be allowed to do？应当容许学生们做什么？2.含情态动词的积极语态变被动语态的变化环节:(以 should 为例，见下图)语法精练Ⅰ.用括号内所给单词的合适形式填空。1.Many more trees should ________(plant) this year.2.Must the work ________(finish) by 6:30 this afternoon?3.Where can the lost boy ________(find)?4.Thanks to the Internet，different kinds of information can ________(learn) in a short time.5.The water should ________(not put) here.6.The bad food shouldn't be ________(eat).7.The stars can ________(not see) in the daytime.8.Can this kind of bike ________(buy) in that shop?9.The fruit should ________(keep) well during winter.10.Should I ________(allow) to make my own decisions?Ⅱ.按规定完毕下列句子，每空一词。11.Nobody can answer the question.(改为同义句)The question ________ ________ answered by anybody.12.We should clean our teeth twice a day.(改为被动语态)Our teeth should ________ ________ twice a day.13.Can you take good care of the children？(改为被动语态) ________...
