Unit 4 Inventions第 2 课时 阅读栏目导航课 时 精 讲课 时 过 关课 后 拓 展课 时 精 讲课文重点句子讲解。 1．The following are three of the most important inventions in history. 以下是三个历史上最重要的发明。 the following 下述；下列 在句中作主语时，谓语动词用单数还是复数取决于后面谈及的人或事物的单复数。 The following is a true story. 下面是一个真实故事。 【小试牛刀】 (1)The following ___(be)what I want to say. (2)The following _____(have)many different styles. ishave2．In the early 19th century, the first trains began to carry passengers. 在 19 世纪早期，第一列火车开始载客。 In the early+序数词+century = at the start of + the+序数词+century，表示“在……世纪 的初期”。 【小试牛刀】 在 20 世纪初期，人们开始使用电脑。 _____________ 20th ________, people began to use computers. In the earlycentury3．Since then, people have been able to speak to each other over long distances. 从那时起，人们已经能够长距离彼此说话。 (1)since then 自从那时以来 since+某时间(某个时间点或者过去时态的一个句子)+sb. have done sth.“自从某时间开始，某人已经做了某事” (2)be able to do sth. = can do sth. 能够做某事 The little baby is able to run now. = The little baby can run now. 【小试牛刀】 (3)But much has changed ___________(从那以来)． (4)We have learnt English ______ 2008(从 2008 年以来)． since thensince4．The mobile phones allow people to keep in touch with each other anytime, anywhere. 手机允许人们在任何时间，任何地方彼此保持联系。 (1)allow sb. to do sth. 允许某人去做某事 (2)allow doing sth. 允许做某事 It doesn’t allow taking pictures here. 这里不允许拍照。 【小试牛刀】 (3)在博物馆允许我们拍照吗? Are we allowed ________________________ in the museum? (4)这里允许吸烟吗？ Does it ______________ here? to take photos/picturesallow smoking5．With light bulbs, people can do as many...
