四年级下现在进行时讲解一

1、一、现在进行时的定义，构成，标志性词语定义：表示现在或现阶段正在进行或发生的动作或存在的状态。构成： 由 be(am/is/are)+ V-ing 形式构成标志性词语：now look listen1. 现在进行时.通常用“now”.eg: I am doing my homework now.2. 现在进行时.通常用“look”.eg: Look! My mother is wearing a greyhat.3. 现在进行时.通常用“listen”. eg: Listen! They are reading books.、动词现在分词的构成规则1 一般情况下直接加ingthink-thin

2、kingsleep-sleepingstudy-studyingspeak-speaking say-sayingcarry-carrying2以不发音的字母e结尾的单词，去掉字母e,再加ing come-coming make-makingleave-leaving have-havingtake-taking wake-waking3 以重读闭音节（重读闭音节即两个辅音中间夹一个元音并且重读的音节）结尾，呈现 “辅，元，辅”结构的动词，双写末尾的辅音字母，再加 ingstop-stopping sit-sitting run-running forget-forgettingbegin-b

3、eginning这类词还有：cut, get,hit, run, set, spit, stop, swim,beg, drop, fit, nod, dig, regret等。4 以 ie 结尾的动词，把ie 改为 y ，再加 ingdie-dying lie-lying tie_tying记 doing 口诀进行时很好记,be 加动词 -ing;直加双写去哑e, 分词构成须仔细;别说 be 动词无词义, 主语和它最亲密;变疑问句提前它, 变否定句be 后加 not 莫忘记 ;何时要用进行时now， look,listen, 是标志。趁热打铁：写出下列动词的现在分词形式.talk sleep

4、 watch run listen make laugh lie cry sing cut write 三、现在进行时的用法1）用来表示说话时正在进行或者发生的动作，例如：eg:-What are you doing-I am reading a book.Mother is cooking in the kitchen. 妈妈在厨房里煮饭。What are you looking at 你在看什么2）用来表示现阶段正在进行的动作（但说话时不一定在进行），例如：eg:He is teaching at the school.We are learning Unit5 these days.Is

5、 she writing a novel 她正在写一本小说吗(3)现在进行时的句子中常有 now,或在句首常出现Look! Listen!等提示词 eg:Listen! Danny is singing in the room.Look! He is doing his homework now.（4）. 用来表示即将发生的动作，一般是指按计划或者安排好要发生的动作。适用于这种情况的动词主要有：go,come,leave,start,arrive 等。例如:I m going home in half an hour. 我一个半小时内要回家。The train is arriving soon

6、. 火车很快就要到达了。I m coming . 我马上来 四、现在进行时的句式变化? 肯定式结构：主语+be +v-ing+ 其它 .如 : I am reading a book.We are running now.? 否定式结构：主语+be+not+V-ing 形式+其他. 例如：They aren t doing their homework.I am not writing my homework now.? 一般疑问句式结构：Be+±语+动词-ing形式+其他 例如:Is she having an English lesson回答：肯定Yes, she is. 否定

7、:No, she isn t.Are they running nowYes, they are. No, they aren t.? 特殊疑问句式结构：疑问词+be+主语+其他? eg:What is he doing now回答： He is swimming.一 . 用所给动词的适当形式填空.! The cat(run)up the tree.twins( 双胞胎 )(have)breakfast.(clean) the blackboard now No,he isn t.(play)the piano in the ask him to come here.! They(sing)i

8、n the classroom.汉译英1 .我们正在上英语课。.2 .他们正在打扫教室.3 .汤姆正在吃早饭.4 .那对双胞胎正在睡觉.5 .男孩子们正在踢足球.6 .她正在弹钢琴。.7 .我们正在看电视。.8 .你们正在听音乐吗.二.选择填空. mother is TV.ata book -Yes,I am. ,read ,read ,reading ,looking ,the other students . ,listen singing,is listening ,are listening singing,are listening my eraser,but I can '

9、 t it.for ,finding findingjook for looking for,find ,look for and I doing homework now.A. am,their B. are their C. is our D. are our father and mother are.A. Buses driver B.buses drivers C. bus drivers D.busdriver are talking today ' s newspaper.A. To B. with C. of D. about you like on the grass

10、A. To sit B. siting C. sitting D. both A and C9.1. his is the way our hair.A. That we comb B. to comb C. of combing D. all the above 三.句型转换 am watering the flowers.（ 否定句 ） 's jumping now.（ 一般疑问句）boys are playing cards.（戈U线提问）复数句）4.He is doing his homework.（四改错, 把错误的地方下面画上横线，并在后面改出来。1、我的妈妈正在做早饭。M

11、y mother are makeing breakfast.2、我正要和我的朋友去看电影。I is goes to movies with my friend.3、他们正在弹吉他吗Is he playing the guitar4、她不在拉小提琴。She isn playing violin.5、她们在干什么正在打篮球。What is she doing They are playing the basketball.6、 Lucy 和 Mary 正在打排球。Lucy and Mary is playing the volleyball.五按要求完成下列句子I am having a birthday party.（ 一般现在时）tonight（ 一般将来时）sings a song in the room.now（ 现在进行时）tonight（ 一般