四级作文的注意事项四级作文的注意事项作文不理想的几个原因作文不理想的几个原因英语底子薄弱词汇量限制缺乏思想，深度不够缺乏应试技巧1 同级比较 1） In 1998 we produced as many cars as we did in the previous five years.2） We have accomplished as much in the past three years as would have taken ten yearsin the past.2 比较级 1） Children now enjoy better medical treatment than before.2） We can live longer without food than we can (live ) without water.3 最高级 1） This is the most interesting book Ive ever read.2） Of all his novels I like this one best.比较结构（比较结构（1）比较结构（比较结构（2）4 the morethe more结构1) The harder you work, the greater progress you will make.2) The more a man knows, the more he discovers his ignorance.5 选择比较 1) I prefer staying at home to going out.2) They prefer to work rather than (to) sit idly.3) He prefers to work alone.6 对比1) Motion is absolute while stagnation is relative.2) He is tired out, whereas she is full of vigour.三、表达原因的结构三、表达原因的结构考生病句： 1. The real reason to our failure is not far to seek.2. The reason for this is because some people want to earn plenty of money without working hard.正确表达：1. The real reason for our failure is not far to seek. 2. The reason for this is that some people want to earn plenty of money without working hard. 表达原因的结构（表达原因的结构（1）1. Now that we have seen these great achievements with our own eyes, we feel moreproud than ever of our country.2. Professor Liu is strict with us because he wants us to make rapid progress.3. Since we live near the sea, we enjoy a healthy climate.4. Pollution is still a serious problem, not that we dont have the ability to solve it, but that some people have not realized the consequences of the problem.表达原因的结构（表达原因的结构（2）1. The reason for this change is quite obvious.2. Diligence is the key factor of success.3. Idleness is the root of all evils.4. He was ashamed to have made the mistake.(=He was ashamed that he had made the mistake. =He was ashamed because he had made the mistake.) 四、否定结构四、否定结构考生病句1. Some people think we neednt to worry about fresh water.2. Nowadays many people dont like to go to the movies, too.正确表达：1. Some people think we neednt worry (或dont need to worry) about fresh water.2. Nowadays many people dont like to go to the movies, either.完全否定结构完全否定结构否定短语：keep.from, protect.from, prevent.from, let alone+动原，更不用说, at a loss, in vain, instead of, out of the question, rather than, too.to, by no means绝不, anything but,.1） Women fail to get the equal rights in some countries. 在一些国家里妇女没有得到平等的权利。2） This is by no means the best way to solve the problem of energy crisis. 这不是解决能源危机的最好的办法。3） We should protect trees from being destroyed. 我们应保护树木，不让它们受破坏。4） In old China we could not make a nail, let alone (make) machines. 在旧中国，我们连一个钉子都造不了，更不用说制造机器了。 半否定意义表达半否定意义表达barely, hardly, few, little, rarely, scarcely几乎不，简直没有, seldom, not all, not everyone, not everything,.具有半否定的意义。 quite a few / little相当的例句：1） We could hardly see any fresh vegetables in winter on market several years ago. 几年前在冬天市场上很难见到新鲜蔬菜。2） These young people know little about how to choose good books to read.这些年轻人几乎不知道如何挑选优秀的书籍来读。 不含否定意义的否定结构不含否定意义的否定结构有些词和词组形式上是否定结构，但其含义是肯定的，比如：cannot but动原, cant help, no sooner.than一就, not.until, in no time, none other than除以外, nothing but,等等。例句：1） We cant but face the reality. 我们只有面对现实。 2） These old buildings will be replaced by modern apartment buildings in no time.这些旧建筑将很快为现代化的公寓所代替。否定结构的倒装语序否定结构的倒装语序1） On no account should we follow blindly.我们决不应当盲从。2） No where has the world ever seen such great enthusiasm for learning as in our country.没有任何其他地方有我国这样高的学习热情。 五、含有五、含有it的结构的结构考生病句：1. As is known to all of us that science and technology play an important role in the development of society.2. It is known to us, practice makes perfect.正确表达：1. It is known to all of us that science and technology play an important role in the development of society. (或:As is known to all of us, science.)2. It is known to us that practice makes perfect. (或:As is known to us, practice.)it 的基本用法的基本用法1作形式主语It is necessary for us to master a foreign language skillfully. It makes difference whether we could purify the air or not.2.作形式宾语We find it rather difficult to prevent people from doing that. Modern science has made it possible for babies to grow healthily and for people to live longer.3.引导强调句It is only by this way that we can achieve success. It was then that people began to realize the importance of controlling population.