现在进行时专项练习。
一。 现在进行时的用法
1）表示说话时正在进行或发生的动作，这时可以不用时间状语，也可以和now, at present, at the moment等时间状语连用。有时用一个动词，如look（看），listen（听）。
eg: what are you reading nowlisten! someone is singing in the classroom.
2）表示当前一段时期的活动或现阶段正在进行的动作。
eg: they are working in a factory these days. more and more people are giving up smoking.
3）表示最近按计划或安排要进行的动作。 即可以用来代替将来时。
eg: when are you le**ing? are you going to tibet tomorrow?
二．现在进行时的标志词：通常在句子中有以下的词：now, look, listen.
1 .look！ that dog is chasing the ball!
2 .he is listening to the radio now.
3. listen! she is singing .
三。 现在进行时的结构： 主语+ be（am, is,are ）+动词 ing
四．现在进行时的四种句式。
1）肯定句：主语+ be + doing
如： 1. i am listening to the music now. 2. the students are drawing pictures now.
2）否定句：在be（am, is, are）后加not “主语+ be not + doing”
如： am not listening to the music now. students are not drawing pictures now.
3）疑问句：be + 主语 + doing？
如：1. is amy singing? yes,she is.\ no, she isn’t. 2. are they swimming ?
4）特殊疑问句：特殊疑问词+一般疑问句
are drawing pictures now.(对划线提问) -what are they doing ?
2 she is singing in the classroomwhere is she singing ?
五。 现在进行时的动词变化：
（1）一般在动词原形末尾加-ing。
stay－staying do－doing listen－listening suffer－suffering
（2）以辅音字母加不发音的字母e结尾的动词，先去掉e，再加-ing。如：
make－****** take－taking give－giving ride－riding
（3）以一个元音字母加一个辅音字母结尾的重读闭音节词，先双写这个辅音字母，再加-ing。如：
put－putting sit－sitting run－running win－winning begin－beginning
现在进行时的练习：
1．mr zhengread) a book now.
2. the rabbitsjump) now.
3.. look ! tom and johnswim).
4. my brothermake) a kite in his room now.
5. look! the busstop
6. weh**e) an english class now.
7. listen! someone iscome
8. theycatch) butterflies（蝴蝶） now.
9. hedo) an experiment（实验） now.
10. theycollect) stamps now.
11. look! hedive) now.
12. tomwatch ) tv in the dining room.
13. the doctorsget ) off the bus.
14. come on. ,theyle**e ) now.
15. iteat) fish now.
16. my fatherwork) in the office now.
17. where is your mother? sheanswer) the phone.
18. the teachersrun) now
19. tom and his fatherswim）now.
20. look! theyrun）along the street.
21. we __practice）hard these days because we will h**e a big match next month.
22. ayou __study）english? b: yes, i am.
23. let’s go out. itnot rain）now.
24. hurry up! everybodywait）for you.
25. a: _you / listen）to the radio? b: no, you can turn it off.
26. a: whatyou / look）for?
b: ilook）for my wallet. there is something important in it.
27. look. it __rain）hard. we’ll get wet if we go out.
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