例句 1 是 93 年 12 月六级考试 11 分作文的评分样卷句子,例句 2 选自 97 年 1 月四级考试作文。很显然,两个考生混淆了 it 和 as 的用法。如果用 it 作形式主语,后面的主语从句必须由 that 引起;如果用 as ,则后面不能用 that ,因为 as 是关系代词,代表 practice makes perfect .
It 在英语中是个相当活跃的代词,在写作中我们常要使用它。以下几种用法应熟练掌握,并能灵活运用。
1 .作形式主语
It is necessary for us to master a foreign language skillfully. It makes ifference 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.
从语法结构来看,上述的句子都不难,或者可以说是考生相当熟悉的。然而在写作考试中,多
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