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课件网) Unit 13 We're trying to save the earth! SectionA GF-4c 4a Fill in the blanks with the correct forms of the verbs in brackets. Joe: _____ you ever _____ (take) part in an environmental project Eric: Yes, I have. I _____ (help) with a Clean-Up Day last year. It was _____ (consider) the biggest clean-up project this city ____ ever ____ (have). Have taken helped considered had had 参加 Joe: How many people ____ (take) part Eric: I _____ (think) more than 1,000 people _____ (come) to help out. Joe: That’s fantastic! I guess everyone in this city is _____ (try) to improve the environment. Eric: Yes, we can’t afford to ____ (wait) any longer to take action! took think came trying wait v. 承担得起(后果); 买得起 4b Fill in the blanks with the appropriate modal verbs from the box. People _____ think that big things_____ be done to save the earth. Many forget that saving the earth begins with small things. For example, you ____ save electricity by may/might must can can would could have to should must may/ might turning off the lights when you leave a room. You _____ also use reusable bags instead of plastic bags. I think it’s a great idea that you now _____ pay for plastic bags in some stores. And instead of driving to school or work, you _____ ride your bike or walk. If it’s far, you _____ take the bus. All these small things _____ add up and become big things that could have to can/should can/could _____ improve the environment. Let’s take action now! could would/can 六 种 时 态 时态 一般现在时 一般过去时 现在进行时 过去进行时 一般将来时 现在完成时 用法 表示经常性发生的动作、习惯性动作或客观真理、科学事实等。 表示过去某个时间发生的动作或存在的状态。 表示现在或现阶段正在进行或发生的动作。 表示过去某时正在进行的动作或存在的状态。 表示将来某个时间要发生的动作或存在的状态。 表示过去发生或者未发生的事对现在造成的影响或结果。 构成 方式 1. 动词be(am/is/are) + 表语… 2. 动词原形 + … (主语是第三人称单 数，动词也用第三人称单数) 1. 动词was/were + 表语 2. 实义动词的过 去式 + … be(am/is/are) + 动词的现在分词 was / were + 动词的现在分词 1. will/shall + 动词原形 (shall 用于第一人称) 2. be going to + 动词原形 主语 + have / has + 过去分词 + … 句 型 变 化 疑 问 式 1. Be + 主语 + … 2. Do/Does + 主语 + 动词原形+ … 1. Was/Were + 主 语 + … 2. Did + 主语 + 动词原形 + … Be + 主语 + 动词的现在分词 + … Was / Were + 主语 + 动词的现在分词 + …？ 1. Will/Shall + 主语 + 动词原形+ … 2. Be + 主语+ going to + 动词原形 + … Have / Has + 主语 + 过去分词 + …？ 否 定 式 1. 主语 + be + not + … 2. 主语+don’t/doesn’t + 动词原形 + … 1. 主语 + was/were + not +… 2. 主语 + didn’t + 动词原形 + … 主语 + be + not + 动词的现在分词 + … 主语 + wasn’t (was not) / weren’t (were not) + 动词的现在分词 + … 1. 主语 + will/shall not + 动词原形 + … 2. 主语 + be + not + going to + 动词原形 + … 主语 + haven’t / hasn’t + 过去分词 + … 4c Make a list of things that people can do to help the environment and discuss your li ... ...
