Unit10SectionAGrammarFocus～4c单元语法清作业课件 2023-2024学年人教版九年级英语全册

第三课时　Grammar Focus～4c ——单元语法清 ►be supposed to do sth.中的to是动词不定式符号，其后要跟动词原形；be随主语的人称、数和时态的变化而变化。 (1)be supposed to do sth.意为“应该做某事”，它可以表示劝告、建议、义务、责任等，相当于情态动词should。 Everyone is supposed to wear a seat belt in a car.每个人在坐车时都应该系安全带。 (2)其否定形式为：be not supposed to do sth.，常用于口语中，意为“不被许可/不应该做某事”。 You are not supposed to smoke on the bus.你不应该在公交车上抽烟。 (3)其一般疑问句形式为：Be＋主语＋supposed to do＋其他？ Was Lucy supposed to lock the door when she left the classroom? 当露西离开教室时，她应该锁门吗？ (4)其特殊疑问句形式为：特殊疑问词＋be＋主语＋supposed to do＋其他？ What are we supposed to do to save water in our daily life? 在日常生活中，我们应该做什么来节约用水？ (5)was/were supposed to do sth.相当于should have done sth.表示过去本应该做某事而并没有做。 The train was supposed to arrive half an hour ago.火车本该在半小时之前到达。 【注意】表示根据规定或传统习惯，人们应该做某事的时候，be supposed to do和be expected to do两者可以互换。但是be expected to do比be supposed to do的主观性更强。 She is expected to be a good doctor.她有望成为一名好医生。 ►“It is＋adj.＋to do sth.”为固定句型，其中it是形式主语，真正的主语是动词不定式(短语)。因为动词不定式(短语)作主语相对较长，为了避免头重脚轻，所以用it作形式主语。 【拓展】 ①“It is＋adj.＋for sb. to do sth.”意为“对某人来说做某事是……的”。此句型中的形容词常用于表示事物的特征、特点，如easy，hard，difficult，interesting，important，impossible等，用来说明后面的动词不定式。 It's hard for me to answer your question.我很难回答你的问题。 ②“It is＋adj.＋of sb. to do sth.”意为“做某事某人是……的”。此句型中的形容词常用于表示人物的性格、品德，如good，kind，nice，clever，polite等，用来说明of后的sb.。 It's very kind of you to help me with my English.你帮助我学习英语真是太好了。 一、用括号内所给单词的适当形式填空。 1．He was supposed _______ (come) to the meeting，but he didn't. 2．What were they supposed _______ (do) in the face of danger? 3．We are not expected __________ (arrive) late when we have a meeting. 4．It's convenient _________ (take) a bus to go to school. 5．It is good for people ________ (walk) after dinner. to come to do to arrive to take to walk 二、单项选择。 (　 　)6.Parents are ______ to teach their children how to develop a good habit. A.invited B．allowed C．stopped D．supposed (　 　)7.Students are not supposed ______ loudly in the reading room. A．speak B．speaking C．to speak D．spoke D C (　 　)8.If you are invited