Unit 2 Period 2 Language points-2022-2023学年高中英语课堂同步精美课件（人教版2019）（选择性必修第三册）

Unit 2 Healthy Lifestyle Learning Objectives Learn about some factors about a healthy and unhealthy lifestyle and ways to break bad habits; Read the passage and try to understand the main idea and the detail of it; Learn how a bad habit is formed and how we can break it by creating good ones; Try to use the words, phrases and sentence patterns to describe the “habit cycle” and how teens should develop good habits. 1. As teenagers grow up, they become more independent… ▲ 此句是复合句，as teenagers grow up是时间状语从句，as表示“随着”。 eg As time went on, he got used to living with his host family and felt at home. 随着时间的推移，他习惯了跟寄宿家庭生活在一起，不感到拘束了。 as还可以引导其它从句，如： It was a close finish, as they had predicted. 正如他们所预料的，比赛结果难分上下。 The race was called off as a hurricane struck. 由于飓风袭击，比赛被取消了。 Happy as they were, there was something missing. 尽管他们很快乐，但总缺少点什么。 My sleep left me as the light left the night. 睡眠弃我而去如同光明离开黑夜。 2. These bad habits, if left unchecked, could lead to more serious ones when they become adults. ▲ 此句为复合句。if left unchecked是条件状语从句的省略，if后面省略了they are，完整的形式为if these bad habits are left unchecked。 状语从句的省略 1) 可以省略成分的状语从句：时间、条件、让步、方式。 2) 状语从句省略成分的条件：从句主语与主句主语一致，或从句主语是it; 从句谓语含有be，包括系动词be、进行时态的be或被动语态的be。 3) 常见的连词：when, while, once, before, whenever, if, unless, though, although, as, as if。 4) 状语从句省略成分后常见的类型：连词+现在分词/过去分词/ 介词短语/ 形容词。 eg If involved in the case, you will be punished. If neccessay, you can choose me to make the presentation. 2) 在if 引导的条件状语从句中，当状语从句的主语是 it，且谓语动词是be 时，it 和 be 可以省略。 If (it is) possible, you should try to visit Washington, D.C. Would you drop in at my house this afternoon if (it is) convenient to you? 3) if 省略结构的固定结构： It sounds like something is wrong with the car’s engine. If so, we’d better take it to the garage immediately. Please tell her your feelings about the things around if possible. Please let me know how many are coming, if any. The most severe punishments are seldom, if ever, applied. I’d say he was more like his fathe