一、教学目的：
1．了解雨的形成过程。知道rain/ cloud/ vapour/ water之间的必然联系。
2．培养学生善于观察、乐与思索，从小热爱大自然,热爱科学的良好习惯。
3．能运用where does the ______ come from?句型。
二、教学过程：
step 1 warm-up
1.greeting.
2.let’s sing .
step 2 presentation
1.with the pictures and the questions , the teacher presents the words “rain , cloud , vapour, sun , stream” and the sentence “where does the rain come from ?”.
where does the rain come from ?
raincloud
   (sun)
streamvapour
2.chant .
rain , rain , lovely rain  .
i like the lovely rain .
cloud , cloud , beautiful cloud .
i like the beautiful cloud .
vapour , vapour , white vapour .
i like the white vapour .
sun , sun , warm sun .
i like the warm sun .
stream , stream , pretty stream .
i like the pretty stream .
3.listen and repeat .
4.riddles .
(1)it goes into the river and stream. it goes into the lake and sea . when it comes , you can see people take the umbrellas
(2) sometimes it’s white . sometimes it’s black  .  sometimes it looks like a dog . sometime it looks like a cat .
(3) it’s big . it’s old . it’s red . it’s warm . it’s round . it comes up in the east . and it goes down in the west .
(4) it’s white and light . it comes from the water . when the sun shines , it comes out .
5.fill in the blanks .
6.look at the picture and do pair work :
step 3 consolidation
1.ask and answer.
where does thecome from ?
it comes from the vapour .
    pair work :
a: where does the rain come from ?
b: it comes from the cloud .
milk
pork
apple juice
mutton
orange juice
rain
water
cloud
cloud
rain
2.summary
3. know it!
everything in the nature is helpful and necessary (必须的).
they are mutual(彼此的) friends .
let’s love them and protect(保护) them .