范文一：
trees are important to our life.trees provide oxygen to us.as we all know during photosythesis,carbon dioxide is taken in while oxygen is given off b the trees.so trees are very important as they replanish the air.trees are also natural resources,we uesed trees to make paper and furniture,we eat the fruits which bear from the tree.besides all these,trees also help to save our environment.the roots of the trees can hold the soil firmly which helps to reduce the chances of surface run-off,soil erosion and even land slide.less sol particles will be washed into the river by rain,thus there will be less water pollution and floods.
leaves are natural fertilizer.when the leaves fall onto the ground.they will decay gradually.the decomposed leaves are source of nutrients which can fertile the soil.
in conclusion,trees are useful in many ways,and they are very important to us
范文二：
Trees are important and useful to humans.They play an important part in our life.
They take harmful gas from the air,and release oxygen.They are natural and free air conditioners as they produce clean and fresh air for people to breathe.They prevent soil loss and reduce the possibility of flood.They are also the home of wildlife.They provide food for both humans and animals,.Trees can be used to make a lot of things,such as furniture,paper and pencils.Besides,trees make the environment more beautiful.
However,we cut down and burn millions of trees every year but replace few of them.We can hardly imagine how terrible our life would be if there were no trees.Trees help humans and the earth in so many ways.They are our friends.