能换成if，因为if不能引导主语从句。） 以上两句中真正的主语是名词性从句。
(2)情态动词
1.分类
情态动词有四类：
①只做情态动词：must,can(could),may(might)…… ②可做情态动词又可做实义动词：need,dare,will
③具有情态动词特征：have(had,has) to,used to，ought to
④情态动词表猜测：一肯一否三不定（must一肯，can not一否，may，might，could，三不定。） 注：mustn't代表强烈禁止 must表示主观，have to表示客观。 2.位置
1- 具有助动词作用，可以用来构成否定句，疑问句及用于简单回答。 Can you sing an English song？ 你会唱英语歌吗？ Yes I can.
是的，我会。
2-后接动词原形，即不带to的不定式。 She may lose her way. 她可能迷路了。
3-无人称和数的变化。 We must stay here. 我们必须待在这儿。 He must stay here. 他必须待在这儿。
4-有一定的词义，但并不完整，必须与动词原形一起构成谓语。
在以Could引导的表示委婉语气的疑问句，常用来表示请求别人帮助或对长辈的请求的。如：（Could you come to my party on Saturday afternoon?）注意的是这里不是情态动词的用法。 回答为：肯定：Yes，I can./Sure./Certainly. 否定:Sorry,I am afraid not.
在作否定回答时，要注意：在拒绝长辈的请求时，不能用can not，这样显得语气太过生硬，不礼貌。但是在长辈拒绝晚辈的请求是可以用cannot的。
Step3. Exercises
1. Finish off the exercises on the book. 2. Check up the answer.
Step4. Summary
Summarize what was taught in this period
Step5. Homework
江苏省技工院校 教案首页
授课 3.4 日期 班级 1201 1203 12机 12建 3.6 课题： Lesson 11 A Change for Fun 教学目的要求： 1. Review the new words and expressions learnt last period. 2. Practise the dialogues. 教学重点、难点： 1. Learn how to use the simple present tense. 2. Learn the possessive adjectives. 授课方法： Teaching and exercises. 授课执行情况及分析：The students have mastered the important points in the dialogues. 板书设计或授课提纲 Warm-up activities：5’ New lesson：40’ Exercises：25’ Summary: 5’ Homework：5’
教学活动及板书设计
Step1 Lead-in 1. greet the students as usual 2. check up homework Step2. Unfolding Lesson 11 A Change for Fun I. According to the text, choose the best answer from the three choices below. II. According to the text, fill in the blanks with the main text information. III. Fill in the blanks with the right words or phrases from the text. IV. Fill in the blanks. V. Cloze test. VI. Reading comprehension.VII. Translation exercises. Step3. Exercises Correct the workbook. Step4. Summary Summarize what was taught in this period. Step5. Homework Preview. 江苏省技工院校 教案首页
授课 3.4 日期 班级 1201 1203 12机 12建 3.6 课题： Lesson 12 Barbie Doll 教学目的要求： 1. Read and spell the words and expressions correctly. 2. Remember the important phrases. 教学重点、难点： 1. Learn how to use the there be. 2. Learn prepositions of time. 授课方法： Teaching and exercises. 授课执行情况及分析：The students can learn the dialogues easily. 板书设计或授课提纲 Warm-up activities：5’ New lesson：40’ Exercises：25’ Summary: 5’ Homework：5’
教学活动及板书设计
Step1 Lead-in 1. greet the students as usual 2. check up homework Step2. Unfolding Lesson 12 Barbie Doll Important new words and phrases: (1) on sale & for sale Many sweet foods are on sale in the store. 这家商店在廉价出售多种甜食。 These are britain's cheapest homes set to go on sale for just a pound. 英国最便宜房屋即将出售，仅卖1英镑。 Their works, which are for sale, have been exhibited across france and america 一些待售的作品已经在法国和美国展览过 Prices are currently being suppressed by a large overhang of vacant houses for sale. 目前，房价因待售空房大量过剩而受到抑制。 (2) prefer I became a teacher because I preferred books and people to politics... 我当了老师，因为我更喜欢书本和人而不是权术。 I prefer going by bike. 我宁愿骑单车去。 (3) however & but This was not an easy decision. It is, however, a decision that we feel is dictated by our duty... 这很难抉择。不过，我们觉得自己有义务作出决定。 Some of the food crops failed. However, the cotton did quite well... 有些粮食作物歉收。但棉花的收成仍相当不错。 Place the saucepan over moderate heat until the cider is very hot but not boiling... 把炖锅置于中火上加热，直到苹果酒变得很烫，但不要加热到沸腾。 They need to recruit more people into the prison service. But another point I'd like to make is that many prisons were built in the nineteenth century. 监狱需要招募更多的工作人员。但我想补充一点，很多监狱都是在19世纪建造的。 (4) stick to But one problem is that few people can stick to a diet for long.