英语（四年级下）主要知识点整理（例句都是课本中原句）1. 祈使句：表示请求、命令、建议等的句子。祈使句不需要主语，谓语动词用原形，句子末尾一般用感叹号。eg: (1) Dont walk on the grass! （否定祈使句）(2) Lets make a newspaper! （肯定祈使句）2. 一般现在时：经常发生的动作或状态 (常与always, usually, often, sometimes, seldom, never, every day/week/year, on Sundays .连用)(1) be动词的一般现在时：（比较简单） I am, We/You/They are, He/She/It is，There is+单数名词或不可数名词, There are + 复数名词eg: Its not beautiful, but its helpful.(2) 行为动词的一般现在时：（单数第三人称的变化是重点、易错点; 助动词用do, dont, does, doesnt）eg: (1)This machine cuts the potatoes.(2) Does he live in New York?(3) Fish live in the river and birds live in the tree. (*注意fish单数和复数写法一样，这里fish前面没有a, 所以是复数形式，后面接谓语动词要用原形。另外，Sheep和deer单复数也是一样的形式)3. 一般过去时：表示过去发生的动作或状态（常与.ago, yesterday, the day before yesterday, last week/year/month, once upon a time, one day, the next day, in 2016.连用）(1) be动词的一般过去时：I/He/She/It was, We/You/They were, There was+单数名词或不可数名词, There were + 复数名词eg：Once upon a time, there was a boy. (讲故事常用说法)(2) 行为动词的一般过去时：(助动词用did, didnt)一般动词变化：构成法：1. 动词原形+ed. 如：look-looked2. 以e结尾的词+d. 如：live-lived3. 以辅音字母+y结尾的词，改y为i, 再加ed. 如：study-studied, cry-cried.4. 以重读闭音节或r音节结尾，末尾只有一个辅音字母的词，双写这个辅音字母，再加ed. 如: clap-clapped, stop-stopped, prefer-preferred 不规则动词变化：如had, said, put, saw, got, ran, learnt(英式写法), bought, came, took, went等eg1: The animals had a concert last week.eg2: The next day, the boy ran to the village again.eg3: What did he play yesterday?eg4: When did you get up last Sunday? I got up at 8 oclock.4. 一般将来时：表示还没有发生但将要发生的事情或动作(常与tomorrow, the day after tomorrow, next year/month/week, soon, in the future, in . minutes/hours/days.连用 )(1) Be going to+ 动词原形：多表示即将发生，最近打算、计划、安排好要做的事情，主观性较强 (区分人称，be动词变化am, is, are)eg: Shes going to visit Australia.(2) Will+动词原形：多表示即将发生的动作或状态，不受主观因素影响的单纯的将来，客观性较强 (不区分人称，都用will)(*目前小学阶段对这两种形式区分并不明显，可以互换使用)eg: We will go to the zoo on Sunday.5. 现在进行时：表示正在进行或发生的动作 (常与now, at present, at this moment连用)Be动词+动词的现在分词(*区分人称，注意动词的现在分词构成的特殊情况）动词的现在分词构成法：(1)一般规则：动词+ing, 如: work-working.(2) 以e结尾的动词去掉e加ing. 如: live-living, have-having.(3) 以重读闭音节或r音节结尾，末尾只有一个辅音字母的词，双写这个辅音字母，再加ing. 如: swim-swimming, clap-clapping, refer-referring.(4) 以ie结尾的重读开音节的词，改ie为y, 再加ing. 如: die-dying.eg: (1) Whats happening now?(2) Daming is making a card for his father.(3) We are having a party.6. 购物相关话题：（1） I want to buy a pen.（2） Its expensive/cheap.（3） It costs one hundred and eighteen yuan.（4） Who wants to buy it?7. 音乐演奏相关话题：(*演奏乐器前要加定冠词the )(1) I played the piano yesterday.(2) Youre playing the violin for your father.(3) My mum and dad played in the concert.(4) In the end, everyone clapped.(*注意玩球类运动不能加定冠词the, eg:I played football yesterday. ) 8. 时间相关话题：(1) Whats the time now?(2) What time is it now?(3) Its 2 oclock.(4) Is it breakfast/lunch/dinner time now?(5) The Chinese cartoon Shaolin Kids is on TV at 8 oclock.9. 方向相关话题：(1) Where is the library?(2) Its in the north/south/west/east of China.(3) I went to the north/south/west/east.(4) Beijing is the capital of China.10. 原因相关话题：(1) Why do fish live in the river?(2) Because cats cant live in the water.