高二英语下知识点总复习教案

　　【注】die out意为"消亡""灭绝"，而die off则意为"(一个一个)地死亡"。如: ① The leaves of this plant are dying off. 这株植物的叶子正在一片一片地凋谢。② The deer in the forest are dying off from disease. 森林中的鹿正因疾病而陆续死亡。

　　33. This in turn had an effect on the food supply for wolves. 这样反过来又影响了狼的食物供应。(p. 47 最后一段第2行)

　　▲in turn意为"依次""逐个地""转而""反过来"。如: ① Theory is based on practice and in turn serves practice. 理论以实践为基础，反过来又为实践服务。② We'll cross the bridge in turn. 我们将挨个过桥。③ The students answered the teacher's questions in turn.学生们依次回答老师的问题。④ The boys were summoned in turn to see the examiner. 男孩们被依次叫进去见考官。⑤ He spends too much time on maths, and this in turn affects the progress of his other subjects.他在数学上花的时间太多，这同时影响他的其他学科的进步。

　　【注】以上用法中的turn不能用作复数。

　　【注】 take turns at (或in) doing sth. 意为"轮流做某事"，相当于do sth. in turn。注意两短语中名词的单复数。① Mary and Helen took turns at sitting up with their sick mother. 玛丽和海伦轮流熬夜陪伴她们生病的母亲。② The athletes took turns in singing songs and reciting poems. 运动员们一个接一个地唱歌和朗诵诗。

　　【注】 turn也可解释为"短时间的活动", 相当于a short period of activity, turn在这里作可数名词用。如: ① I'll take a few hams round the deck before I go to bed. 就寝之前我要在甲板上散一会儿步。② I'll take a turn at the oars now if you want a rest. 如果你要休息，我来划一会儿浆。

　　拓展：take one's turn 轮班(做某事); take turns 轮流(做某事); by turns 轮流; on the turn 将好转

　　高二英语Unit17 Disabilities知识点总复习教案

　　Section I 课前准备、听力、口语

　　1. Talk about disability? 谈一谈残疾 (p. 49 Goal 1)

　　* disability和inability

　　▲ dis-和in-都是表示否定意义的前缀，但用在ability前，表示不同的意思，disability意为"残疾"，而inability意为"无能力""没办法"。请比较下列例句，注意这两个词的不同意思。① I was surprised at her inability to do things promptly. 她不能迅速处事，我感到惊异。② She is deaf，but refuses to let her disability prevent her from doing what she wants to do. 她失聪，但她不让自己的残疾妨碍自己去做想做的事。③ His inability to pay his debts made his parents worried. 他无力偿还债务使他父母亲很着急。④ Her lack of experience is a severe disability. 她缺少经验是一个严重的障碍。

　　【注】ability的形容词是able，其前也有两个否定前缀，dis-和an-表示不同的意思，disable是动词，意为"使......伤残"，而unable则是形容词，表示"不能的""不会的"。如：① That illness disabled him and left him unable to work. 那病使他残疾，不能工作。② An accident disabled him from teaching. 一次交通事故使他再也不能教书了。③ He seems unable to understand the simplest instructions. 他看来似乎连最简单的说明也不懂。④ He was unable to sleep at night because of his anxiety. 他因焦虑而晚上睡不着。

　　2. Imagine what difficulties and dangers you might face. 想像一下你可能面对的困难和危险。(p.49 Warming up Ex.1) ▲ imagine

　　(1) vt. imagine + 名词／代词／动名词／从句 ① Can you imagine a fat man like that climbing? 你能想像得出那样胖的人爬山吗? ② I can't imagine asking him for money. 我难以想像向他开口要钱。

　　注意：imagine不接不定式。只接动名词 ① It's hard to imagine a greater threat to world peace. 难以想像还有对世界和平更大的威胁。② You can't imagine how I missed the bird. 你想像不到我是多么想念那只鸟。

　　注意：imagine sb. to be结构，但不能说imagine sb. to do. 如: You imagine yourself (to be) in the place. 设想你处在这个位子上。

　　(×) I can't imagine you to do anything worse.

　　(√ ) I can't imagine you doing anything worse.

　　我难以想像你还能做更差的事。

　　(2) imagine可用于双重问句形式，其结构为特殊疑问句，imagine部分为插入部分，类似动词还有think, believe, suggest, suppose, guess等。① What do you think his explanation is? 你认为他的解释是什么? ② Which mouse do you imagine we should pick out? 你认为我们该挑哪种鼠标?

　　注意：该句型为特殊疑问句形式，所以回答时应用特殊疑问句的回答形式。-- How much do you think this car cost? 这车你认为值多少钱? -- I think it costs 4, 000 dollars. 我认为值4 000美元。

　　注意：此类动词反问句的构成有两种情况：当主句主语是第一人称时，反问根据从句；当主句主语为二、三人称时根据主句。① I think she is the best student in our class, isn't she? 我认为她是我们班最好的学生，不是吗? ② She thinks that he should have finished his work, doesn't she? 她认为他已完成了工作，是吗?

　　(3) imagine，believe，suppose，think等词在构成否定句时一般要否定前移，同时注意这些词的肯定、否定答复。① I don't think he will be the likeliest candidate for the manager of human resource department. 我认为他将不是人力资源部经理最可能的人选。② I don't think that he did the best. 我认为他并非最好。③ --Do you think Tom is the best student in our class? 你认为汤姆在我们班上是最好的学生吗? -- Yes, I think so. (肯定答复)是，我认为是。-- No, I think not / I don't think so. (否定回答)不，我认为不是。

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