In August,1996,Peter Hessler,a young American teacher of English,and a colleague decided to take a boat 　1　along the Three Gorges.

　　They bought tickets 　2　the Jiangyou boat.They left the docks on a beautiful afternoon.As the sun set they 　3　 at Fengdu.They slept through the first gorge,which is called the Qutang Gorge.At Wushan they made a 　4　 up the Daning river.The next day they went through the Wu Gorge.They passed the Xiang River,home of Qu Yuan,the 3rd century BC 　5　.Along the Yangtze River,every rock looked like a person or animal,every stream that joined the great river 　6　its legends,every hill was 　7　 with the past.As they came out of the third gorge,the Xiling Gorge,they sailed into the 　8　site of the dam.On a distant mountain was a sign 　9　20-foot characters."Build the Three Gorges Dam,　10　the Yangtze River," it said. 　　After three minutes' preparation,ask several students to share their answers in the whole sentences.Then check the answers from the whole class.

　　Suggested answers:

　　1.downstream　2.for　3.docked　4.detour　5.poet　

　　6.carried　7.heavy　8.construction　9.in　10.Exploit

　　Ask the students to read the whole passage together.

　　Step 2 Grammar

　　T:Okay,so much for the check-up.Now,we are going to revise modal verbs.How much do you know about modal verbs?Let me give you a quiz about modal verbs.Let's see how much do you know about them.

　　(Show the following sentences on the screen.)

　　Decide whether the sentences are true(T) or false(F).

　　1.Modal verbs have only one form in the present tense.()

　　2.Modal verbs all have a present,past and future form.()

　　3.Some modal verbs have more than one meaning.()

　　4.Modal verbs are followed by the infinitive with to.()

　　5.To ask questions with modal verbs you use the auxiliary verb do.()

6.To make a modal verb negative you use don't.() 　　Ask the students to finish them individually,and then call back their answers.

　　Suggested answers:

　　1.T　2.F　3.T　4.F　5.F　6.F

　　T:No.2,4,5 and 6 are wrong statements.Do you know how to correct them?Who'd like to do No.2.(Encourage the students to volunteer to answer your questions.)

　　Sa:Not all modal verbs have a present,past and future form.For example:Must only has one form.

　　T:Wonderful job!No.4.

　　Sa:Modal verbs are followed by the infinitive without to.

　　T:Yes,good.We all know modal verb +原形v.

　　（Finish the four questions like this.）

　　T:I can see you have know the basic rules of modal verbs.Let's do some other practice.Look at Activity 1.The sentences are all from the passage in reading.Complete them and answer the questions following them.

　　(Show the following sentences on the screen.)

　　1.They __________go anywhere they wished.

　　2.You __________go on those ships.

　　3.There __________be any other foreigners.

　　4.We just __________show our passports.

　　5.We __________see the sun setting behind the white pagoda.

　　1.Which verb is used as the past of must?

　　2.Which verb indicates an ability to do something?

　　3.Which verb makes a prediction about the future?

　　4.Which verb is used to give advice?

5.Which verb indicates the permission to do something?