可见，“从疑入手，以疑激趣”的教学方法是一种值得推广的方法。 (教学新理念)课程《手术台就是阵地》 教学资料高一英语下：Unit 18 New Zealand 第三课时教案 I. Teaching aims: Talk about New Zealand. learn grammar: the use of “It” as Subject. Similar dialogue presentation with new words and expressions used within II. Teaching aids: none Step I Revision Step II word study Finish the exercises in Student book, page 40. Step III Practice Let Ss finish the exercises “vocabulary, 2/3” in page 79, Workbook Step IV Grammar 1. it也可以代替不定式或从句在句中作形式主语，即： It be +adj. +（n.）+that +clause或It be adj. +to do sth.，那么that引导的从句和不定式是句子中的真正主语，这个用法是为了避免长句作主语导致句子的不对称，如： It is difficult to finish this job on time（= To finish the job on time is difficult）.要按时完成这项工作是很困难的。 It is strange that she doesn’t want to travel. 她竟然不想旅游，这个让人感觉很奇怪。 It is a good thing that he helps me with English study on Sunday. 星期天他帮助我学习英语是一件好事。 2. it作主语时可以指时间，日期，距离或天气，也可以指无识性别的婴儿。如： It’s ten past twelve. 现在是十二点十分。 It is two miles to the beech. 离海滨有两英里。 It was raining this morning. 今天早上天在下雨。 It is Saturday today. 今天星期六。 Step V Exercises let Ss finish the exercises ‘grammar’ in Workbook Homework Finish off the exercises in Workbook （教案和教学设计）课件高一英语下：Unit 18 New Zealand 第三课时教案教育资源 第19课时：有理数的混合运算(1)
