•3.Most people believe smoking causes cancer.(It is believed...)

•4.Arguing with him is no use.(It is no use...)

Step 5 Role play(group work)

T:Suppose your friend or one of your classmates is a smoker,how will you persuade him to quit smoking?Give students some tips and useful expressions.

Step 6 Make a summary

1.Some key words and phrases(quit ban addicted...)

2.Review the use of"it"〔1〕impersonal"it"can be used to talk about time,distance,weight,cost etc.﹙2﹚"it"can be used as formal subject or object to stand for the real subject or object(the infinitive,ing form or a clause)

3..As we all know, to keep healthy or lead a healthy life is a permanent(永恒的)topic to us.And a truly healthy person is someone who is healthy in both body and mind.So we must develop some good habits,try to relax,to keep a good mood,to be happy every moment,to take regular exercise,keep a balanced diet...to build our body.However,we need to get rid of or break away from some bad habits,such as,drinking alcohol,drug abuse,smoking,etc.Just remember:Health is the most important thing in the world.Let's keep trying,come on!