Unit5 Section A Grammar Focus-4c课件2023-2024学年人教版初中英语八年级下册

Unit 5 What were you doing when the rainstorm came？ Section A Grammar Focus-4c Understand the concept and scope of use of the past continuous tense. Master the basic structure of the past continuous tense. Simply distinguish between the simple past tense and the past continuous tense. 1 2 3 Aims Review 狂风 乌云 严重的暴风雨 在街区 确保 猛烈地撞击窗户 入睡 in the neighborhood heavy rainstom/serious storm black clouds strong winds make sure fall asleep beat heavily against the windows Presentation Simple sentences: 现在进行时 She is drinking water. He is singing. They are dancing. 过去进行时 She was drinking water. He was singing. They were dancing. Presentation 过去进行时的结构 肯定形式 否定形式 问句形式 was/were+doing He was sleeping at that time. was/were+not+doing He was not sleeping at that time. Was/Were+主语+doing Was he sleeping at that time? Presentation 动词现在分词的变化规则： 口诀 规则 例子 直 1.一般情况下，直接在动词之后+ing. play--playing study--studying 去 2.以不发音的e结尾的动词，去e再加ing. take--taking dance--dancing 双 3.重读闭音节的动词，双写尾字母再加ing. cut--cutting swim--swimming 变 4.以ie结尾的动词，把ie变为y再加ing. lie--lying die--dying tie--tying Grammar 1.过去进行时：was/were +V-ing 2.when, while 引导的时间状语从句。 What were you doing at eight last night? I was taking a shower. What was she doing at the time of the rainstorm? She was doing her homework. What was he doing when the rainstorm came? He was reading in the library when the rainstorm came. What was Ben doing when it begin to rain heavily? When it begin to rain,Ben was helping his mom make dinner. What was Jenny doing while Linda was sleeping? While Linda was sleeping,Jenny was helping Mary with her homework. Grammar When 和While 引导的时间状语从句 共同点 不同点 when 都可以引导时间状语从句，意为“当......的时候” 引导时间状语从句时，既可以表示时间点，也可以表示时间段；从句中的谓语动词既可以是非延续性动词，也可以是延续性动词. （多用于过去时态） while 引导时间状语从句时，从句只表示时间段；从句中的谓语动词必须用延续性动词。 （多用于进行时态） Presentation Example ① I was walking to school when I saw a cat in a tree. ②When Sally arrived home, her mother was cleaning the house. 主句的动作是持续性的，此时用 ______ 引导时间状语从句，主句用 __________ 时态，从句用________