Unit 10 SectionA grammar-4c课件2022-2023学年人教版八年级英语下册

Section A 3 Grammar focus – 4cSection A 3 Grammar focus – 4c 1. How long have you had that bike over there? I’ve had it for three years. 2. How long has his son owned the train and railway set? He’s owned it since his fourth birthday. 3. Have you ever played football? Yes, I did when I was little, but I haven’t played for a while now. Study the sentences,and think when we use the Present Perfect Tense(现在完成时) 表示从过去已经开始持续到现在的动作或状态,可以和表示“从过去某一时刻延续到现在的一段时间状语”连用,如“for+时间段”、“since+过去时间点”、“since+过去时的从句”、“since+一段时间+ago”。且for与since引导的时间状语可以相互转换。 Present Perfect TensePresent Perfect Tense 现在完成时现在完成时 e.g. My uncle has worked at this factory for ten years. = My uncle has worked at this factory since ten year ago. I’ve lived here since 1990. 自从1990年以来我就住在这里。 I haven’t seen him for three years. 我三年没有看见他了。 1. We have lived here _ 1990. 2. — How long have you studied here? — _ 5 years. 3. The boy has had a bad cold _ last night. 4. I have waited _ two hours. since since For 二、用for和since完成句子 for 6 6 5. I have taught in the school _ I came here. 6. We have been friends _ a long time. since for Interview a student(采访一个同学): 1.How long have you…? 2.How long has he/she…? (cleaned the desk, run, danced, read the book, written the letter ,swum) 此种用法中表示持续性的动作或状态的 动词必须是延续性动词(否定句除外)。 1. 这本书我买了5年了。 I have bought the book for five years. ( ) I’ve had the book for five years. ( ) × √ 句中动词的特点句中动词的特点 2. 你哥哥参军多长时间了? How long has your brother joined the army? ( ) How long has your brother been in the army/been a soldier? ( ) × √ 1. 转换为相应的延续性动词,用于现在完成时。(一个单词换成另一个单词) borrow — keep (kept) buy — have (had) put on — wear (worn) catch a cold — have a cold (had) get to know — know (known) 非延续性动词和延续性动词之间的转换非延续性动词和延续性动词之间的转换 2. 转化为“be + 形容词/副词/介词/名词” come/go/ — be + in/at/on相应的介词短语 get to/arrive/reach -be + in/at/on相应的介词短语 leave — be away from die — be dead fall sleep — be asleep fall ill- be ill join — be in/be a member of … become — be 2. 转化为“be + 形容词/副词/介词/名词” come back- be back get up -be up wake up-be