
中小学教育资源及组卷应用平台 Unit 10 Air 单元知识点讲解 I. 必记单词 air n. 空气 everywhere pron. 到处 alive adj. 活着的 balloon n. 气球 factory n. 工厂 smoke n. 烟 dirty adj.. 脏的 clean adj. 干净的 hurt v. 感到痛 fresh adj. 清新的 plant v. 种植 II. 常考短语 keep… alive 让…活着 plant trees. 种树 make…clean 使…干净 III. 重点句型 It keeps them high in the sky. It is important to all people. We all need it to keep us alive. IV. 单元语法 -- 一般现在时态 一、一般现在时的用法 ①一般现在时表示经常性或习惯性的动作,常与表示频度的时间状语 every day usually always often sometimes on Sunday 等连用 如: I get up at 6 o’clock every day. 我每天 6 点起床。 I go to school at 8 o'clock every morning. 我每天早上 8 点去上学。 My mom makes breakfast for me every day. 我妈每天给我做早餐。 ②一般现在时表示客观存在及普遍真理 如:Summer follows spring. 春天之后是夏天。 The sun rises in the east. 太阳从东方升起。 注意:此种用法即使出现在过去的语境中,仍用一般现在时。 如:I learned that the earth goes around the sun when I was in primary school. 我在小学就学过地球是围绕太阳转的。 ③一般现在时表示格言或警句 如:Pride goes before a fall. 骄者必败。 Practice makes perfect. 熟能生巧。 ④一般现在时表示目前的情况或状态如:I am a teacher. 我是教师。 You are a student. 你是学生。 以 here, there 等开始的倒装句,表示动作正在进行。如:Here comes the bus. = The bus is coming. 车来了。 There goes the bell. = The bell is ringing. 铃响了。动词三单的变化规律 二、一般现在时的构成 ①be 动词:主语 + be (am, is, are) + 其它。如: I am a boy. 我是一个男孩。 You are a girl. 你是一个女孩。 She is a teacher. 她是一个老师。 注意:我用 am,你用 are,三单 is,复数 are。 ②行为动词:主语 + 行为动词 + 其它 如:We study English. 我们学习英语。 I have two sisters. 我有两个妹妹。 He learns to play the piano. 他学钢琴。 注意:(当主语为第三人称单数(he, she,it)时,要在动词后加"-s"或"-es"。如: Mary likes Chinese.玛丽喜欢汉语。) 三、一般现在时的句型变化 be 动词的变化 ①否定句:主语+ be + not +其它 如:He is not a worker. 他不是工人。 ②一般疑问句:Be +主语+其它 如:-Are you a student —Yes. I am. / No, I'm not. ③特殊疑问句:疑问词+一般疑问句 如:Where is my bike 我的自行车在哪? 行为动词的变化(do/does) ①否定句:主语+ don't( doesn't ) +动词原形(+其它) 如:I don't like bread. 当主语为第三人称单数时,要用 doesn't 构成否定句如:She does not play the guitar. ②一般疑问句:Do( Does ) +主语+动词原形+其它 如:Do you often play football —Yes, I do. / No, I don't. 当主语为第三人称单数时,要用 does 构成一般疑问句 如: Does she go to work by bike - Yes, she does. / No, she doesn't. ③特殊疑问句:疑问词+一般疑问句 如:How does your father go to work 例题精炼 一、选择题 1.The windows are _____. Please clean the windows, Tina. ( ) A.cold B.fresh C.dirty 2.The bad news from my parents made _____. ( ) A.I sad B.me happy C.me sad 3.Please _____ the window open. We need _____ air. ( ) A.make; dirty B.keep; alive C.keep; clean 4.There are a lot of _____ in the park, so the air is so _____ here. ( ) A.tr ... ...
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