高中英语it用法知识点总结.doc

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时间：2021年x月x日
海纳百川
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高中英语it用法知识点总结_
　　It的用法是高中英语知识点之语法考查的热点和重点。它的用法多，考察形式多样，要求广大考生全面掌握其基本用法。酷课网根据历年高考对it用法考察归纳总结了高考常考点及注意事项。
　　 is+被强调部分+that
　　该句型是强调句型，将被强调的放在前面，其他部分置于之后，(强调的主语如果是人，可以用who来替换that) 如果把这种句型结构划掉后，应该是一个完整无缺的句子，这也是判断强调句型与其他从句的方法。(如果强调的是动词就要用到do的各种形式)
　　It was they that (who) cleaned the classroom yesterday.
　　---Where did you buy the apples?
　　----It was on the farm where we worked. (True)
　　----It was on the farm that we worked.(False) 注解：如用that，答非所问。
　　考点：强调句和定语从句的综合考查。
　　2. It is not until +被强调的部分+ that
　　考点：强调句 和倒装句
　　强调句：It was not until she took off her dark glasses that I realized she was a film star.
　　倒装句： Not until she took off her dark glasses did I realise she was afilm star.
　　注意事项：是主句倒装，分句不倒装。
　　3. It is clear (obvious, true, possible, certain) that.
　　该句型中it是形式主语，真正的主语是that引导的主语从句，常译为清楚(显然、真的、肯定)是主语从句最常见的结构。
　　It is very clear that hes round and tall like a tree.
　　4. It is important (necessary, right, strange, natural) that
　　该句型和上一句同属一个句型。由于主句中的形容词不同，that后的从句中要用虚拟语气(should+动词原形)should 可以省去。建议记住该句型中的形容词。
　　It is important that we (should) learn English well.
　　It is necessary that he (should) remember these words.
　　考点：主语从句和虚拟语气的综合。
　　5. It is said (reported, learned, believed ) that
　　该句型中的it 仍是形式主