给你个提纲把.
先表明你的观点
然后正反：
People think should buy a car for the following reasons:
1 convinent to work and travel
2 some people just want to show off(炫耀)
On the other hand,some holds that we should not buy a car:
1 to protect our invironment/car consume oil and polute air
2 it's hard to afford the cost of car oil,the oil price is high.
All in all.最后再次表明你的观点那你认为买车好还是不好咧QAQ，我不晓得啊。。我认为不买车好。主要是买不起。嘿嘿。坐公交车挺好的，节约型社会嘛。(*^__^*) 嘻嘻……