解析：A、动词变现在分词可有如下口诀:一般-ing；哑e先去e；重闭单辅先双写；-ie结尾y来替。
B、动词现在分词的变化规则要与名词变复数、动词变现单三等规则区分开来。 2、谓语部分的构成不完整：丢掉be动词，或忘记把动词变成现在分词。例： （1）误：Look! Two children flying (fly) a kite in the park. 正：Look！Two children are flying (fly) a kite in the park. （2）误：Li Ming isn’t read ( not read) a book in bed now. 正：Li Ming isn’t reading ( not read) a book in bed now.
解析：现在进行时的谓语部分的构成是“be+现在分词”，二者缺一不可，这一点必须要牢记。 3、对动词或动词词组提问时，丢掉代动词doing。例： The students are singing in the room.(对划线部分提问) →误：What are the students in the room? →正：What are the students doing in the room?
解析：现在进行时态中对动作提问可记住此句式“What +be +主语+doing+其它?”或简写为“What......doing......? ”句式。
4、现在进行时态的谓语部分是并列结构时，容易忽视第二个以及第二个以后的动词用现在分词形式。例： 孩子们在跑还是在跳？
误：Are the children running or jump? 正：Are the children running or jumping?
解析: or连接的是两个并列成分，动词形式须一致。 Practice
（一）单项选择填空：
1、 Look! He _____their mother do the housework. A. is helping B. are help C. is help D. is helpping 2 、_____are the boys doing ? They are singing in the room. A. Who B. How C. What D. Where 3、 Don’t talk here. My mother _____ .
A. is sleeping B. are sleeping C. sleeping D. sleep 4、Danny ______. Don’t call him.
A. is writeing B. is writing C. writing D. writes 5、---- When_____ he_____back? ----Sorry, I don’t know.
A. does, come B. are coming C. is come D. is coming （二）用括号中动词的适当形式填空
1、 It’s ten o’clock. My mother _____ (lie) in bed. 2、 What____he _____(mend)? 3、 We _____(play) games now. 4、 What ____you____ (do) these days? 5、 ____he ___ (clean) the classroom? 6、 Who____ (sing) in the next room?
7 、The girl____ (like) wearing a sweater. Look! She ____ (wear) a red sweater today.
存在，所有，感官，认识，情感：（状态）
存在： keep ,stay , remain , be, consist of （由……组成）, contain 所有： have ,belong to（属于） , possess, own , hold
知觉： sound(听起来)，hear , look /seem /appear (看起来)， smell（闻起来）, taste（尝起来）,feel (摸起来) ， see ,
认识： understand, know, suppose, remember, admit, forget, believe, think 情感：like, love, hate , prefer,
Unit5 Water Key words
1. drop 2. journey 3. quantity 4. experiment 5. fresh 6. salt 7. voice 8. reservoir 9. add 10.chemical 11. through 12.valuable 13.bit 14.bank 15.change 16. return 17. vapour 18. form 19. stir 20. continue 21.crystal Key phrases
1.turn off 关掉 turn on 打开 2. a bit 一点
3. pocket money 零花钱 4. be made up of 有某物组成 几分之几
quarter 1/4 half 1/2 two thirds 2/3 three fifths 3/5 先分子，再分母， 分子用基数，分母用序数，
当分子为大于1的整数时，分母要变复数。 把A加入B add A to/into B
e.g They cleaned me and added some chemicals to me.
Mr. Li added some salt into the soup. 李先生向水中加了一些化学物质。 through across over辨析 through 穿越某一空间 e.g He went through the corridor. across 穿过某一平面 e.g He walked across the street. over 越过某一障碍物
e.g He ran over the buses, and went into Bainaohui. 使某物变……
make sth. + adj. (clean / dry) e.g People will make me clean again. Mr. Li made the security guard very angry. 使某物保持某种状态 leave sth. adj.
e.g. I left the tap on in the bathroom. Please leave the door open.
Mr. Li left his computer on for the whole night. interesting / interested v+ing 令人xx的（东西） v+ed xx的（人）
e.g. The film is very interesting. Mr. Li is very interested. 拓展：对某物感兴趣的 be interested in sth.
e.g. Mr. Li is very interested in films.
Key sentences