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1.use…to 和 should的用法
2.正确理解并朗读课文
教学过程：
光盘单词卡片，课文图片，PPT
教学过程：
Step1 Lead-in
1.Free talk
2. Show a picture of the earth.
T:Look, what’s this?
S:.Our Earth.
Let the students make sentences with ：
The Earth is...
We... the Earth.
There is/are ...on Earth.
3.What should we do to protect the Earth?
Let the students say something about the text.
Save water, save energy, save trees, don’t use too much plastic
4.Pair work:
Why should we save water/trees/energy?
Because...
5.Read and retell the text.
6.Fill in the blanks according to the text. Do Ex 1.
Water?is?u________.?We?can’t?live?without?water.?We?drink?water?and?use?water?to?clean?things?every?day.?In?many?p________,?there?is?not?m_______?water.?We?should?not?w_______?water.?We?should?r________?and?s______ it.?In?this?way,?our?Earth?will?be?beautiful?and?clean.
Energy?is?u________.?M_______?o___?the?energy?comes?fromc_______?and?o_____.There?is?not?much?coal?or?oil?on?Earth.?We?should?s_______?energy.?We?should?not?drive?so?much?because?cars?use?a?lot?of?energy.?In?this?way,?our?Earth?will?be?beautiful?and?clean.
Trees are u________. W_______ comes from trees. We use wood to make tables, chairs and many o______ things. We should not c______ d________ too many trees because trees help keep the air c________. In this way, our Earth will be beautiful and clean.
Plastic is u_________. We use plastic to make bags and bottles, but too m_______ plastic is b______ for the Earth.We should not use too m________ plastic bags or bottles. We should use p________ bags and g________ bottles.
In this way, our Earth will be beautiful and clean.
7.Show some pictures and tell the students a short story.
8. Do Ex 2.
Water has no colour, no shape, no taste and no smell. Water is everywhere. It’s in the ocean, in the sea, in the river and in the lake.