【2022】初二上学期英语二单元知识点.docx
初二上学期英语二单元知识点疑问句现在完成时的一般疑问句式是把助动词have或has提到主语之前。回答：Yes, have (has).No, havent (hasn t).否定句：现在完成时的否定句式是"haven't (hasn't)+过去分词”。3 .现在完成时的时间状语：already, just, yet, since, ever, never;4 .与一般过去时的区别：一般过去时是强调动作在过去发生，而 现在完成时是强调过去发生的动作对现在造成了影响和后果。5 . 一般过去时的时间状语：yesterday, just now,ago, last week, 2 years ago, in 1980 等。例：We planted (plant) some flowers in the garden last week.I have sent (send) the letter.He has come (come ) back home, he is watching (watch) TV now.David finished (finish) his homework just now.The monkeys are full, because we have fed (feed) them. A：I have lost (lose) my purse!8. Bad luck! When did you lose (lose) it?A： I lost (lose) it last night.与现在完成时连用的几个副词：already, just, ever, yet, never肯定句： already, just疑问句和否定句： ever, yet, neveryet常置于句末already, never, ever just 一般置于助动词have/has 之后，过 去分词之前.例：用 already, just 或never, yet 完成句子1) I have been to many big cities, but I have never been to Shanghai.2) Most of us have already finished our compositions.3) Have they taken down the old pictures yet ? No, not yet.4) He has already visited Beijing twice.5) I have just heard the news. I know it.7.现在完成时中的for和since(l)for + 一段时间(用How long提问)We have known each other for ten years. 我们相识 10 年了。(2) since +句子/具体时间since引导的短语或从句用How long提问since+过去一个时间点(具体的年、月、日、钟点等)。Tom has eaten nothing since yesterday.since + 一段时间+agoWe have been friends since five months ago. 从 5 个月 前起, 我们就成了朋友。since+从句，表示“自过去某个时间、某件事情以来”，从句 时态：一般过去时。I have lived here since I left Shanghai.©It is+一段时间+since从句，表示“自从某件事发生已有一段 时间了”。It is two years since I left school.8.在含for或since引导的时间状语的现在完成时中，谓语动词 只能用延续性动词。非延续性动词不能直接和for或since连用。leave be away die be deadbegin/start be on finish be overcome here be here go there be therecome back be back fall asleep be asleepget to/ arrive/reach be (in) leave be away fromgo (get) out be out open sth keep sth openjoinbe in+组织机构/be a member of+组织机构fall ill be ill get up be upcatch a cold have a cold borrow keepbuy have get to know knowput onwear 例：1. The old man died 4 years ago.The old man has been dead for 4 years.2. It is 4 years since the old man died.Four years has passed since the old man died.3. He joined the Party 2 years ago.He has been in the Party for 2 years.4. I bought the book 5 days ago.I have had the book for 5 days.
