Lesson 43

　　Step 1 Revision

　　Revise the story in Lesson 42， using the questions in Wb Lesson 42， Ex. 2 to help you.

　　Step 2 Reading

　　SB page 43， Part 1. Discuss the picture： What can you see？ Teach the word mirror.

　　Then let the Ss read the passage to find out the answer to the question at the top of the page. （Why did Thomas put a mirror and some lights on the table？）  Ask a student to draw a diagram on the Bb showing what Edison did.

　　Go through the passage and discuss any problems. Note that lights is plural because we are talking about a collection of individual lights. See if the Ss can guess the meaning of any new words.

　　Point out the word formation： operate，

　　operation（v.→n.）； clear， clearly（adj.→adv.）。

　　Explain send for and was saved.

　　Step 3 Reading aloud

　　SB page 43， Part 1. Speech Cassette Lesson 43. Play the tape for the Ss to listen and repeat.

　　Step 4 Workbook

　　Wb Lesson 43， Ex. 1. Do the first two sentences orally with the Ss（ideas）。 Show them where and how to find the answers.

　　Then let the Ss work alone or in pairs. Check the answers with the whole class.

　　The answers to Ex. 1 are： ideas； sent for； at once； light； bad； an idea； all the； put them； behind； see clearly； operated.

　　Step 5 Presentation

　　Talk about a famous singer. Say I think…is a good singer. Don't you think he's/she's a good singer？ Help the Ss to answer Yes， I do or No， I don't. Talk about other singers and actors in the same way. Tell the Ss that we use Don't you think…？ when we want someone to agree with us.

　　Get Ss to make up dialogues in the same way.

　　Step 6 Listen and read

　　SB page 43， Part 2. Speech Cassette Lesson 43. Play the tape for the Ss to listen and repeat. Then get them to practise the dialogue in pairs. See if the Ss can do it  without looking at their books！

　　Point out the use of the infinitive form as a way of asking someone to do something. Take Ask/ Tell him to turn it down as an example. Tell the Ss that to turn is an infinitive and to turn it down an infinitive phrase used as the Object（him） Complement.

　　Step 7 Practice

　　SB page 43， Part 3. Go through the words and expressions in the boxes and make sure the Ss understand what the phrases mean. Do one or two dialogues with individual Ss as an example， then let the Ss practise in pairs.

　　Step 8  Workbook

　　Wb Ex. 2. This exercise gives the Ss more practice. They have to match the phrase in the first box with a suitable reply in the second box. Let them work in pairs， then check the answers with the whole class. The answers to Ex. 2 are： 1 B： Tell him to run more slowly. 2 B： Tell her to keep quiet.

　　3 B： Ask him to turn it down. 4 B： Ask her to drive faster. 5 B： Tell him to drink less 6 B： Tell him to eat less. 7 B： Tell her to take off her coat.

　　Homework

　　Revise the contents of the unit.

　　Ask the Ss to write down the answers to Ex. 2 in their exercise books. （At least 4 or 5 dialogues. ）

　　Ex. 3 is optional.

　　Prepare the passage on SB page 43， Part 1 for a dictation test in the next lesson.