约730字。

　　8A Unit 5 Birdwatchers
　　Content: Vocabulary
　　Period：10－4
　　Teaching aims and demands:
　　1. To get to know prefixes
　　2. To use adjectives in the context of talking about nature reserves and wild birds by applying prefixes to indicate negative meaning.  
　　3. To  show the students an effective way to enlarge their vocabulary
　　Key points:
　　To use adjectives in the context of talking about nature reserves and wild birds by applying prefixes to indicate negative meaning.
　　Difficult points:
　　.  To  show the students an effective way to enlarge their vocabulary by adding prefixes to adjectives
　　Teaching aids:
　　word-cards   pictures
　　Teaching methods:
　　Teaching procedures:
　　Step 1 Presentation
　　1 Revision
　　Check the homework and dictate new words on Page 80
　　2 Using some pictures to elicit some adjectives.
　　Helpful / unhelpful        grateful / ungrateful
　　nkind            lucnlucky
　　Get the students to read the words and then direct their attention to the prefix ‘ un- ’.
　　3 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. Small shoes 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
　　A. Match the adjectives on the left with their opposite on the right.( Part A)
　　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.necessary—unnecessary       2.important—unimportant     
　　3.comfortable—uncomfortable   4.honest—dishonest
　　5.regular—irregular              6.happy—unhappy
　　7.wecome—unwelcome          8.correct—incorrect 
　　9.common—uncommon         10.friendly—unfriendly
　　11.possible—impossible          12.able—unable
　　B. Play a game.
　　Show the word-cards for the students to say the opposite words by adding prefixes.
　　C.Help the students to categorize the words using the following table.
　　And wort some of the rules
　　un- unhealthy, unsafe, untidy, unpopular
　　dis- dishonest
　　im- impolite, impatient, impossible (usually before  ‘p’)
　　in- Infamous, inexpensive
　　ir- irregular
　　il illegal
　　Step 3. Production ( Part B )
　　1.Complete the sentences in PartB, check the answers in pairs. Then go through the sentences in class. Draw the students’ attention to the things they should or shouldn’t do while going birdwatching.
　　2.Game:Prepare a list of adjectives with positive and negative meanings.
　　Read the adjectives one at a time. Every time students hear a negative adjective, they should stand up and repeat it. If the adjective has a positive meaning, students should remain seated and keep silent.
　　3.Complete the following sentences(见练习)
　　Homework.
　　1. Finish the relative exercises.
　　2. Write out the opposite of the following adjectives(见练习)
　　3.Preview Grammar A and B.
　　Read the passage in Reading and try to say out their sentence structures. 复备栏目