1、冀教版英语九年级上 Unit 2 DNA 教案一、 话题topic二、重点词语和短语helpful; twin; clone; exactly; divide; design; secret; nether; nor; discuss; dead; except for; not only but also; neithernor;at the same time.三、重点句型 1. I would call them 我会给它们取名叫2. What if? 如果将会怎么样?3. Neithernor 既不也不4. Not onlybut also 不但而且四、重点句子分析1.I would
2、call them “grananas”我将称呼它们 “葡萄香蕉 ”call+sb./sth.+称呼Well call the baby David.我们给这婴儿取名大卫。2.What if you could combine other animals or plants to make something new?如果你能够把别的动物或植物结合创造出新的东西将会怎样?what if 如果将会怎样What if they had only come earlier?如果他们早来一些会怎样?From your DNA, scientists can identify not only you
3、but also people related to you. 通过你的 DNA,科学家不但能确认你而且还能确认与你有亲属关系的人.not onlybut also 可以连接并列的成分Not only Li Ming but also I have passedthe exam. 不但李明而且我也通过了这次考试.(一)、and 的用法(1)连接两个数词,表示“加” Whats five and six? 五加六等于几?(2)连接两个并列的名词,表示“ 和”I have two pens and three pencils.我有两支钢笔和三支铅笔。(3)位于句首,表示“ 那么,于是然后等,起承上
4、启下的作用。How are you? 你好吗?Fine. Thank you . And you? 很好,谢谢!你呢?二)、but 的用法连接两个并列成分或并列句,表示转折,意思是 “但是,然而”。He is young but very experienced.他虽然年轻,但很有经验。多用于前后对立的场合Its an old car, but its very reliable.这辆车很旧,但很耐用(三)、or 的用法(1)用于否定句中,连接并列成分,表示 也不。He never smokes or drinks.他从不吸烟,也不喝酒。(2)表示两种或两种以上的选择或可能性,意思是或者还是。I want to buy a blue or brown shirt.我想买件蓝色或褐色的衬衣。(3)用在祈使句+or+陈述句的固定句式中意思是不然否则。 Put on your coat, or you Will catch a cold. 穿上外套,否则你会感冒学优中考,网