Unit 10 单元语法沙龙 (一）be supposed to 的用法 be supposed to sth . 意为“应该做某事”，其中to为不定式符号，后跟动词原形，可与should do 互换，两者多用于口语中，也可等同于ought to do sth ，但后者使用较少，多用于正式文体中。 考点1 be supposed to ...意为“应该..理应..” 它可以用来表示劝告、建议、义务、责任、或按规定。习惯、安排等应当做某事，相当于情态动词 should . eg : Teachers are supposed to treat all the students alike . 老师应该对学生一视同仁。 The train was supposed to arrive half an hour ago 火车本应在半小时之前到达。 考题在线1 You should wear running shoes in PE classes . (同义句改写） You’re _____wear running shoes in PE classes . 考题在线2 根据汉语提示补全句子 猫应该逮老鼠。 Cats _____ to catch mice. 考点2 be supposed to ..的否定结构为be not supposed to ..它常用于口语中，意为“不被允许；不应当” eg : You are not supposed to smoke on the bus . 你不准在公共汽车上吸烟。 be expected to 的用法 be expected to 意为“预计；预料”，用来表示预料之中会发生的事，也可意为“应该”， to是动词不定式符号，后接动词原形。 eg : It is expected to have a meeting next Friday . 预计下周五将会有一个会议。 They are expected to be here the day after tomorrow . 他们预计后天到这里。 考题在线3 共享单车的使用人数今年有望达到五千万。 The number of shared bike users _____ reach 50 million this year (expect ) . 考题在线4 A teacher is expected _____with every student . A patient B. to patient C. to be patient D. be patient It +be+adj(+for/of sb) + to do sth 句型 考点1 It+be+adj+to do sth 意为“做某事是...的”it 为形式主语，真正的主语是后面的动词不定式（短语）。因动词不定式（短语）作主语较长，而谓语部分相对较短，故用it代替后就避免了“头重脚轻”的现象。 eg: I think it’s very important to sleep for eight hours a night . 这认为每晚睡8个小时很重要的。 考点2 表示“对某人来说做某事是...的”用句型 “It+be+adj+for sb+to do sth” 表示 “某人做某事真是太...了”用句型 “It+be+adj+of sb+to do sth”其中sb为动词不定式to do sth 的逻辑主语。二者的具体用法为 ： It+be+adj+for sb to do sth 此句型中的形容词为描述事物特征的词，如difficult , important , easy , hard , necessary , possible , dangerous, impossible 等， 是说明动词不定式的 It+be+adj+of sb +do do sth 此句型中的形容词为描述人物品质及性格特征的词，如clever, foolish , good , kind , nice ,polite 等，用来说明of后的sb . eg: It’s hard for me to answer your question . 对我来亦回答你的问题很难。 It was foolish of him to go alone他单独去真是太傻了。 考题在线5 It’s really ____ him to drive after drinking so much wine . A crazy of B. gentle of C. brave for D. wise for 考题在线6 It’s necessary for us _____ English well. A to learn B. learning C. learn 考题在线答案： 1. supposed 2. are supposed 3. is expected to 4. C 5. A 6. A 单元语法专练 单项选择 Everyone is supposed _____ a seat belt in the car . A wearing B. to wear C. to be worn D. wear Parents are _____ to teach their children how to behave well . A taught B. allowed C. suggested D. expected 3 --Why are you so late ? You ____ get here at seven . --Sorry . I was caught in a traffic jam . ... ...
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