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do it yourself教学目标:学习用否定前缀构成反义词的方法。掌握以下含有un-, in- & im-的形容词。uncertain, uncomfortable, unimportant, uninteresting, inactive, incorrect, inpatient, impossible,教学难点:learn how to use prefixes to form adjectives with opposite meaning ; learn how to use the right adjective words with prefixes to talk about the opposite meaning . step 1 1.show some words on the blackboardold-young easy-hard tall-short rude/impolite-polite happy-unhappy kind-unkindnow,we know they are prefixes.2.presentation say: with some adjectives,we can change the meaning by adding a prefix. adding the prefixes “dis”, “im” “in” or “un” to an adjective will express the opposite meaning of the word. these prefixes mean “not” or “the opposite of” e.g. trainers are comfortable to wear.but small ones are uncomfortable. if someone shows good manners to others, he is a polite person. if someone does not show good manners to others, he is impolite. step 2.practice 1.tell the students that “un-” is not the only prefix. there are more prefixes like this. invite the students to open their book and ask them to match the words on the left with their opposites on the right. 1.certainuncertain 2.importantunimportant 2.show some sentences and fill in the blanks with prefixes.zhalong is a protected area. it isnt allowed to hunt or fish there. it is incorrect to kill wild animals. (correct)these trainers are comfortable to wear. but those are uncomfortable. (not comfortable).if someone shows good manners to others, he is a polite person. if someone doesnt show good manners to others, he is impolite. (not polite )3.try to pronounce the underlined words。1.the boy in this picture is jake .he often plays with his cat after school.2.tennis is lilys favourite sport .she likes playing tennis with her father.3.what does she look like?she looks slim.4.the girl has a lot of bags in her hand.she is shopping.5.i am a student .i go to school by bus every day.step 3 小组合作用否定前缀的形容词造句。water is very important to us.this chair is too small.(3) i have never seen such heavy snow here.(4) the restaurant is quite near here.(5)i dont like him because he is rude.step 4 巩固检测try to finish the exercises on page51 and check the answers.usual-unusual possible-impossiblecertain-uncertain tidy-untidystep 5 课堂检测写出下列词的反义词.necessary-_ important-_ happy-_comfort
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