(
课件网) Unit 3 Trees and us 主题范畴： 人与自然 主题群： 自然生态；环境保护 子主题： 热爱与敬畏自然，与自然和谐共生 Key question Why do we need trees *1. insect *2. fight back *3. a glue-like liquid *4. enemy *5. sense *6. recognize *7. call for help *8. bark *9. pine tree *10. bug *11. ladybug n. 昆虫 回击；反攻 一种像胶水一样的液体 n. 敌人 v. 感知 v. 识别；认出 寻求帮助 树皮 松树 虫子 瓢虫 Words and phrases preview P41-P42 （打*为课外拓展或已学词汇） The present continuous 现在进行时 We use the present continuous to show that something is happening now. 现在进行时用于表达某事正在发生。 Li Na is talking to Wang Jie on the phone. Read the dialogue and pay attention to the words in bold. Before-learning Let's read! We call this tense: Present continuous tense 现在进行时 What are you doing now I’m staying with my grandmother this week. I’m watching a TV programme about trees. Su Su and I are working on our group project. We use the present continuous to show that something is happening now. 我们用现在进行时表示(说话时)正在进行的动作。 We form the present continuous tense like this: Subject Verb to be I am (not) You / We / They are (not) He / She / It is (not) Main verb dreaming Form（结构） be (am / is / are) + (not) + V-ing While-learning Is Su Su working on a project Su Su is not working on a project. What is Su Su working on Su Su is working on a project. 现在进行时的肯定句，否定句和疑问句的构成：E.g. Su Su is working on a project. We form the present continuous tense like this: Form（结构） 1. She is watching a ballet. (变否定句) 2. We’re waiting for our teacher. (变一般疑问句) 3. Is Tony calling a friend (作肯定问答) 4. They are lying in the sun. (就划线部分提问) She isn’t watching a ballet. Are you waiting for your teacher Yes, he is. What are they doing 句型转换 Tip: 一般疑问句中，第一人称要改为第二人称。 5. We are playing under the tree with Tom. (就划线部分提问) A B C B. Where are you playing with Tom A. What are you doing under the tree C. Who are you playing under the tree with We form the present continuous tense with the verb am / is / are + verb-ing. We form verb-ing like this: 动词的现在进行时变化 Main verb -ing form Example Most verbs + -ing feel → feeling Verbs ending in silent -e e + -ing write → writing Verbs ending in -ie ie + ying tie → tying Some verbs ending in vowel + consonant double the consonant + -ing run → running Let's sum up the rules! Change the verbs into –ing form. think _____ tell _____ sit _____ come _____ smile _____ lie _____ sing _____ fight _____ change _____ make _____ thinking telling sitting coming smiling lying singing fighting changing making We do not usually use some verbs in the presente continuous. Instead, we use them in the simple present. 有些动词通常不可用于现在进行时态,而用一般现在时。 Look! believe hear like prefer understand hate know love realize want e.g. I know my deskmate well. My younger sister likes eating apples. Chen Li ... ...
