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1、第三章 句 型,在英语中，根据句子用途的不同，可以分为陈述句、疑问句、祈使句和感叹句四类。此外，there be句型作为一种特殊而重要的句型，在小学阶段也应注意掌握。,知识梳理,一、陈述句的概念陈述句是用来陈述事实或者说话人的看法的句子。它包括肯定句和否定句两种。在书写时句末用句点，在朗读时用降调。如：This is a nice book. ( )Susan likes maths very much. ( )My father doesnt go to work on weekends. ( )They arent going to climb the mountain this Satu
2、rday. ( ),第一节 陈述句,二、肯定句变否定句的基本方法1. 句中有be动词的句子：变为否定句时只需在be动词后加not。 如：(1)I am in Grade Six this year. Im not(I am not) in Grade Six this year. (2)Mike is going to play football this afternoon. Mike isnt(is not) going to play football this afternoon. (3) These are red apples. These arent(are not) red a
3、pples. (4) It was a fine day yesterday. It wasnt(was not) a fine day yesterday. (5) We were happy at that time. We werent(were not) happy at that time.,2. 句中含有情态动词的句子：变为否定句时只需在情态动词后加 not。如：(1) Peter can fly. Peter cant(can not) fly.(2) You should stop smoking now. You shouldnt(should not) stop smoki
4、ng now. 3. 实义动词的否定句:谓语动词为行为动词的句子变为否定句时，要根据时态选用do的相应形式(do, does, did)，并在其后加 not。如：(1)I like listening to music. I dont like listening to music. （2）My father likes playing sports. My father doesnt like playing sports.,(3) Grandma does housework every day. Grandma doesnt do housework every day. (4) He
5、did his homework last night. He didnt do his homework last night.【注】加do not, does not或did not改为否定句以后，要把原句的动词改为动词原形，特别是当原句中的谓语动词是第三人称单数形式does或过去式did时，改为否定句一定要记得在doesnt或didnt之后加上do。,4. 几种特殊形式的否定句 (1) 肯定句中含有every的合成词时，变为否定句时将其改为no的合成词。如：Everything is ready Nothing is ready (2) 肯定句中含有always，usually或ever
6、时，变为否定句时将其改为never。如：He is always late for school He is never late for schoolI usually go to the park on foot. I never go to the park on foot. (3) 肯定句中含有many或much时，变为否定句时将其改为few或little。如：Many students know him Few students know him There is much milk in the bottle. There is little milk in the bottle.
7、,(4) 肯定句中含有both，both and 或all时，变为否定句时将其改为neither，neither nor 或none，并注意谓语动词要相应变化。如：Both of us are students Neither of us is a studentBoth you and I are right. Neither you nor I am right.All the students are in the classroom. None of the students is in the classroom. (5)“I think ”句式变为否定句时，只要在think之前加
8、dont 即可。如：I think you are right. I dont think you are right.,考点精析,考点1 考查陈述句基础句型的运用能力 【例1】根据图片将句子补充完整，每空一词。 1.This ruler is _.2.They _ _ _ .,解析：本题考查学生对陈述句基本句型的运用能力。第1小题的句子形式是：主语+系动词+表语。因此，横线上需要填上一个单词或短语对主语进行修饰或限定。第2题只给出了主语They,只要能根据图片内容写出符合图意的句子，并保证句子语句通顺和语法正确就可以了。答案：1. long 2. like playing football
9、/ are playing football,举一反三1. 改错，选出错误项的字母编号并改正在后面的横线上。 ( )(1)My brother is playing piano. A B C ( )(2)Some boys comes in happily. A B C ( )(3)Its going to warm tomorrow. A B C,C,B,B,playing the piano,come in,be warm,2. 用括号内所给动词的适当填空。 (1) There _ some bags in the room. The black one _ mine. (be)(2) A
10、 horse _ run, but it _ fly. (can) (3) David always _ his homework at 7:00 p. m.(do)(4) Look, the fish _ in the water. They are so cute.（swim）,are,is,can,cant,does,are swimming,考点2 考查陈述句的句式转换 【例2】按要求转换句型。1. Today is a rainy day. (改为否定句)2. He does sports three times a week. (改为否定句)解析：本题考查肯定句和否定句的转换，要注
11、意转换规则。第1小题中有be动词 is，则只需要在is之后加上not 即可；第2小题中没有be 动词，而是行为动词do的三单形式does，在改写否定句的时候，要先加上doesnt, 然后再将原来的does 还原为do,放在does之后，这种题是最容易出错的。答案： 1. Today isnt a rainy day. 2. He doesnt do sports three times a week.,举一反三 根据括号内动词的提示，将下列句子改为否定句。 1.Sarah_ (can)swim. 2.I _ (do) want to eat more candies. 3.A tiger _
12、(can) fly,but it can jump. 4.You _ (should) put on your jacket. 5.You_ (must) smoke here. 6.It_ (was)rainy yesterday.,cant,dont,cant,shouldnt,mustnt,wasnt,过关检测,1. 单项填空。 ( )1. My father_ like apples.A isnt B. doesnt C dont ( )2. I _ like pop music.A isnt B. doesnt C dont ( )3. I _go to school yesterd
13、ay.A do B dont C didnt ( )4. Whats this?_ a book.AThat is B Its C This ( )5. I _ many birthday presents. Aam B has Chave,B,C,C,B,C,( )6. My mother _ badminton well. Ais play Bplay Cplays ( )7. I _ free last Sunday.Aam B did Cwas ( )8. The girl reads _.Aloud B loudly Cloudy ( )9. My mother would like
14、 _ some meat. Abuy B buying Cto buy ( )10. Here is a card _ your father. Ain B from Cto,C,C,B,C,B,二、将下列句子改为否定句，每空一词。 1. This is a desk. This _ a desk. 2. My sister can draw pictures. My sister _ draw pictures. 3. We do morning exercises every dayWe _ _ morning exercises every day 4. Mike does his homework after dinner.Mike _ _his homework after dinner. 5. My grandparents did sports in the garden yesterday. My grandparents _ _ sports in the garden yesterday.,
