I must ask him to give up smoking

2. (把握關鍵詞，掌握復述技巧。)
t: please try to talk about the passage in your own words. you can look at the key words on the blackboard.
(幾分鐘之后請2-3名學生復述1。)
for example:
i know a headache isn’t a disease. there is something wrong with our health…
(及時鼓勵學生，增強學生信心。)
step 4 practice 第四步  練習(時間:10分鐘)
1. (閱讀2a，呈現不健康的原因。)
  t: look at the pictures in 2a and read these sentences, please find out the new words, then look them up in the word list.
  (幾分鐘后，提問個別同學。)
  (板書)
germ, human, through, illness
t: these pictures show how germs make us sick. now please listen to the tape and repeat.
  (放2a錄音,對學生有難度的句子可以多次播放并講解。)   
2. (讓學生讀2a，畫出關鍵詞。)
  t: please find out the key words.
  (找學生板書出關鍵詞。)
germs, get into, cause, diseases,
through, the nose/the mouth/the skin,
have an illness
  t: now close your book, let’s talk about these pictures. you can use the key words on the blackboard.
(可用幻燈片或課件、掛圖展示2a。)
3. (總結2a，引出生病的幾種途徑。)
  t: let’s find out the ways of becoming sick, please.
  (板書)
(1)through the nose
(2)through the mouth
(3)through the skin
4. (展示2b圖片，了解預防疾病的措施。)
  t: look at the picture, please talk about what we should do to fight germs? make sure to use “we should/should not…” and “we must/must not…”.
  t: what should we do to fight germs?
  s1: we should keep the air fresh.
  s2: we shouldn’t eat bad food.
  s3: we shouldn’t drink sour milk.
  s4: we should keep our bodies clean.
  s5: we must wash our hands before meals.
  s6: we must keep our fingernails clean and short.
  s7: we must tidy our bedrooms and sweep the floor often.
  s8: we must keep the streets clean.
  (個別圖片中含有生詞，如air, sour, tidy, sweep要及時講解)
5. (開展互動，激發興趣。)
  t: now work in pairs to discuss what we should do to fight germs.
  (教師先給出示范，然后讓學生進行問答并不斷變換角色。)
  for example:
  t: what should we do to fight germs?
  s1: we should…
  s2: what must we do to fight germs?
  s3: we must…
  s4: what must we not  do to fight germs?
  s5: we must not…
t: well done! please write down what we should do to fight germs.
(要求大家盡量不看課本。)
step 5 project 第五步  綜合探究活動(時間:7分鐘)
1. (展開想象，擴大知識面。)
  t: let’s discuss what else we should do to fight germs.
  (盡量脫離課本，并不要與課文內容重復。)