小学阶段现在进行时的结构和用法

小学阶段现在进行时的结构和用法
一、概念
现在进行时表示说话时正在进行或发生的动作,也可表示当前一段时间内的活动或现阶段正在进行的动作．
结构：助动词be ( am / is / are ) +现在分词.
二、现在分词的构成：
1.大多数动词后可在动词后直接加-ing．
Eg: carry-carrying,catch-catching,drink-drinking, enjoy-enjoying
hurry-hurrying ,do-doing , read-reading , think-thinking
2. 如果动词以-e结尾,则去掉-e,再加-ing,
如come-coming , have-having ,
make-making,ride-riding,write-writing,take-taking,use-using．
3. 如果动词只有一个元音字母,而其后跟有一个辅音字母时,将此辅音字母双写,再加-ing
如：hit-hitting,let-letting, put-putting,run-running,sit-sitting．
4. 如果动词有两个音节,且重音在第二个音节上,则末尾的辅音字母须双写,再加-ing,
-upsetting．试比
-preferring,up’set
-forgetting,pre’fer
如: for’get
这些词的重音在第一个音节较’benefit/benfiting, ’differ/differing,’profit/profiting,
上,因此其末尾的辅音字母不双写．
5. 以-ic 结尾的动词,应先把-ic 变为-ick,再加-ing,eg:
panic/panicking,picnic/picnicking,但lie/lying ,die/dying,tie/tying是特殊变化要记住．
三、句型结构：
1.现在进行时的肯定形式、否定形式、疑问形式及其回答,所有变化都体现在助动词be ( is / am / are ) 上．
①现在进行时的肯定形式：主语+be(am/ is/are)+doing+其他成分
I am singing . They are writing .
②现在进行时的否定形式:主语+be(am/ is/are)+not +doing+其他成分
I am not singing . They a ren’t writing .
③一般疑问句及回答：be(am/ is/are)+ 主语+doing+其他成分
Am I singing ? Yes ,you are . / No ,you aren’t .
Are they writing ? Yes ,they are . / No ,they aren’t .
④特殊疑问句及回答:特殊疑问词+be(am/ is/are)+主语+doing+其他成分
What are you doing ? We are playing (要求就提问内容具体回答).
2. 缩写形式如下:
I am---I’m You are---You’re He is---He’s She is---She’s
---We’re They are---They’re
It is---It’s We are
3.说明: 不是所有动词都能用现在进行时态的,如：see、like、want、know 等动词往往都不用进行时态．
练习
一.用现在进行时完成下列句子:
1. ______you__________(fly) a kite? Yes,_______.
2. ______you___________(sit) in the boat?
3. ______he_____________(talk) with me?
4. We_______________(play) football now.
5. What_________you__________(do)?
6. I_____________(sing) an English song.
7. What________he____________(mend)?
8. He______________(mend) a car.
9. These boys _________ (play) tennis on the playground.
10. My mother______________ (cook) in the kitchen.
11. We can’t help you,because we ____________ (have )classes.
12. ________ the boy ___________ (write) his homework?
13. Look! These butterflies _________ (fly) in the sky.
14. Listen! The girl ___________ (sing) in the next room.
15. The naughty boy __________ (swim) in the river.
二.选择
1. Look. Lucy is_____ a new bike today.
A. jumping
B. running
C. riding D takeing
2. The children _____ football.
A. is playing
B. are playing
C. play the
D. play a
3. They ______TV in the evening. They do their homework.
A. are watching
B. can’t watching
C. don’t watch
D. don’t watching
4. Listen! She____ in the classroom.
A. is singing
B. sing C .to sing D. is sing
5. ______are you eating? I’m eating ______ meat.
A. What,some
B. Which,any
C. Where,not
D. What,a
6. Is she ____ something?
A. eat
B. eating
C. eatting
D. eats
7.My dictionary ___,I have looked for it everywhere but still___ it.
D.
C. has lost,haven’t found
A. has lost,don’t find
B. is missing,don’t find
is missing,haven’t found.
8..Having a computer for personal use is no easy task because technology _______ so rapidly.
A. is changing
B. has changed
C. will have changed
D. will change
9. The building_______ ,I can’t stand the noise.
A. was being built
B. is built
C. is being built
D. builds
10. I can’t catch up with the fashion,because the clothes style_______ all the time.
A. has changed
B. is changed
C. is changing
D. changed
11. It’s six in the afternoon. The Greens_______ lunch together.
A. has
B. are having
C. have had
D. had had
12. Don’t make any noise while the students_______ to the class.
A. are listening
B. listened
C. have listened
D. had listened
13. Jack and Ketty_______ in the lake. Let’s join them,shall we?
A. swim
B. have swum
C. swam
D. are swimming
14. Look! The children_______ basketball on the playground.
A. plays
B. played
C. is playing
D. are playing
15. The kite_______ high in the sky now. It looks like a big bird.
A. has flown
B. is flying
C. was flying
D. flew
16.As we all know,the population in the world _______ faster and faster.
A. is grown
B. is growing
C. are grown
D. are growing
17. To my surprise,he_______ in class.
A. is always speaking
B. would always speak
C. has always been speaking
D. does speak always
18. I want to know when he _______ for New York tomorrow.
A. has left
B. is leaving
C. had left
D. has been leaving
19. He_______ of how he can do more for the people.
A. had always thought
B. is always thinking
C.has always been thought
D. thinking always
20. Forests _______ and burned at such a speed that they will disappear from the earth in the future.
A.cut
B. are cut
C. are being cut
D. had been cut。