Unit 1 Art ：Period 3 Grammar—Infinitives(2) as the predicative（学案）- 【帮课堂】高二英语同步学与练（人教2019版选择性必修第三册）

Unit 1 Art Period Three Grammar—Infinitives(2) as the predicative ■观察to do在句子中的成分及其各种形式 1.It is terrible to see the ship sinking into the sea. （成分： ） 2.Do you think it necessary for us to learn to wait?（成分： ） 3.The old man’s job is to take care of the flowers in the garden.（成分： ） 4.He told me not to bring you anything.（成分： ） 5.In my dreams I always have very difficult jobs to do.（成分： ） 6.In his third year, he left Harvard to work for a company called Microsoft.（成分： ） 7.She pretended not to see me when I passed by.（形式： ） 8.AIDS is said to have been the biggest health challenge to both men and women in that area over the past few years.（形式： ） 9.Hurry up! He is sure to be waiting for us.（形式： ） 语法精析 动词不定式是非谓语动词的一种，它没有人称和数的变化，动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语、宾语补足语等，但不能作谓语。本单元主要复习动词不定式作表语的用法。 一、按to do在句中的用法 动词不定式可以放在be，become，sound，taste等系动词后面作表语。具体用法如下： 1.表示目的。 The next step is to make sure that you know exactly what is required. 下一步是确保你确切知道需要什么。 The purpose of education is to develop a fine personality in children. 教育的目的是发展儿童美好的品格。 2.表示事态发展的结果、预期的结果、不幸的命运或预言。 That experience was to change his whole life. 那次经历会改变他的整个生活。 You must speak out，if we are to remain friends. 如果我们要继续做朋友，你必须直言不讳。 You are to die at ninety­eight. 你会在98岁时去世。 3.用于第一人称疑问句，表示征求意见。 What am I to say if they ask me the question? 要是他们问我这个问题，我该怎么回答呢？ What am I to do if I have no money? 如果没有钱，我该怎么办呢？ 4.用于被动语态，相当于can/could，should，ought to，must，具有情态意义。 You are to be rewarded.你应该受到奖励。(should) It’s nowhere to be found.哪儿也找不到它。(can’t be) These books are not to be sold.这些书不应该卖掉。(ought not to be) 5.表示“同意、安排、命令、决定、劝告、意愿、禁止”等。 They are to marry next week.他们将在下周结婚。(安排) Children are not to smoke.儿童不准吸烟。(禁止) You must be patient if you are to succeed. 想要成功，就必须有耐心。(愿望) 6.不定式作表语，可用主动形式表示被动意义。 She is to blame.她应该受到责备。 A great deal is yet to do.还有许多事要做。 Something is still to find out.有些东西还有待查明。 2、 按to do在句中的成分 ■it作形式主