《单元语法聚焦》Plant a Plant PPT课件
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《单元语法聚焦》Plant a Plant PPT课件
第一部分内容:教材典据
1. A worker is there helping them.
一名工人正在那里帮他们。
2. When there is a dust storm in spring, it gets windy and dirty everywhere.
春天有沙尘暴时,到处都有风,变得很脏。
3. Roses smell so wonderful.玫瑰闻起来很香。
4. It grows in eastern Asia.它生长在东亚。
5. When it comes to laughing, this tree is really funny.
就笑而论,这种树真有趣。
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单元语法聚焦PPT,第二部分内容:语法探究
本单元的重点是了解和掌握派生法和转化法这两种构词法。
1.派生法
在一个单词(词根)前或后加上一个词缀,构成一个新词,这种构词法称为派生法。词缀分为前缀和后缀。加在单词前的词缀,叫________;加在单词后的词缀,叫________。
(1)前缀
①一般情况下,加前缀不改变词性,只改变原词的词义。
dis表示“否定,相反,除去”(加在动词前,表示否定意义)。例如:cover遮盖→discover发现
im表示“不,非”(加在形容词或副词前,表示否定含义)。例如:possible可能的→impossible不可能的
②特殊情况下,加前缀改变词性和词义。
a表示“向里,离开,加强”(加在动词或名词前构成形容词或副词)。例如:
sleep (n.&v.)睡觉→asleep (adj.)睡着的
(2)后缀
加后缀构成的派生词与原词的词义有联系,有些会改变词性。
①ed, d表示“……的”,加在动词后构成形容词;加在规则动词后构成过去式和过去分词。例如:
interest使感兴趣→interested感兴趣的
excite使兴奋,使激动→excited兴奋的,激动的
②er, or, n, ese, ian表示动作的执行者(加在动词后构成名词)、具有某国国籍的人或“从事……的人”(加在名词后,词性不变)。例如:
run跑→runner奔跑者;visit访问→visitor访问者;America美国→American美国人;Japan日本→Japanese日本人;music音乐→musician音乐家
③ful表示“充满……的”(加在动词或名词后,构成形容词)。例如:
care小心→careful小心的
④tion加在动词后,构成名词。例如:
invent发明→invention发明
注意: 通过加前缀或后缀派生而成的新词从词性的变化来看,主要有如下几种情况:
(1)动词(Verb)→名词(Noun)
wait等候→waitress女服务员
build建造→building建筑物
write写→writer作家
(2)名词(Noun)→形容词(Adjective)
cloud云→cloudy多云的
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单元语法聚焦PPT,第三部分内容:实战演练
根据句意及构词法,用所给单词的适当形式填空
1.He is one of the best football ________ (play) in the world.
2.They were so ________ (excite) that they jumped up and down.
3.How many ________ (invent) did the inventor invent?
4.He fell ________ (sleep) while watching TV.
5.It's ________ (possible) for me to finish the work by myself. It's too difficult.
6.2017·盐城 Taking a pair of binoculars can help you see the birds _______ (clear).
7.2017·兰州 He is always ________ (care) about his schoolwork, so he keeps making the same mistakes.
8. 2017·黔南 Qiannan is in the ______ (south) part of Guizhou Province.
9.2017·白银 We all need a ________ (health) environment.
10. 2017·临沂 Mrs. Dean was ________ (thank)to the policeman who had helped her kids arrive safely.
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