高考英语语法辅导-it的固定句式讲解

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英语学习内容所占比例在整个小学过程中越来越大，那么如何让英语锦上添花呢?总结英语知识点就变得很有必要了。高考英语语法辅导-it的固定句式讲解为大家整理如下，希望能帮助到大家的学习。
第一，it作形式主语的常见句型
(1)it替代动词不定式的常见句型为：
①It+ be+ adj+ (for sb.) to do sth. 
此处的形容词通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible等。如：
It is illegal for a teenager to drive a car without a license. 
②It +be+ adj.+of sb. to do sth. 
此处的形容词通常为描述人的形容词：kind, unkind, nice, rude, cruel等。如：
It’s kind of you to help me with the problem. 
(2)it替代动词-ing的常见句型： 
It’s no good/use doing...
It’s (well) worth doing...
如：It’s no use crying over spilt milk. 
(3)it替代从句的常见句型： 
①It +be+n.+that从句如：
It is no secret that the president wants to have a second term in office.
②It +be+adj.(important, necessary, surprising...)+that从句 
从句中的谓语动词用"should+动词原形"形式，且should可省略。如：
It’s important that you should apologize to her for your rudeness.
③It +v.+sb.+that从句= It +be+ v-ing +that从句如： 
It worried me that she drove so fast.(= It was worrying that she drove so fast.) 
④It+v.(+to sb.)+ that从句 
常用动词或短语有appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out, work out等。如： 
It (so) happened/chanced that they were out.(= They happened/chanced to be out.) 
⑤It +be+ v-ed +that从句 
常用动词有say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know等。如： 
It is said that the couple have gotten divorced.(=The couple are said to have gotten divorced.) 
⑥It +be +v-ed + that...(should)...
常用动词有demand, request, require, order, suggest, advise, recommend等。如：
It is suggested that they should begin with the third question.
第二，it除了作形式主语外，也可以作形式宾语，如动词find, think, consider, feel, make等，这些词后常用it作形式宾语，替代其后的动词不定式或从句。此外，英语中动词appreciate, enjoy, like, dislike, love, hate, prefer等之后，常用it作形式宾语，替代其后的when/if从句。如：
I find it interesting to talk with her. 我觉得与她聊天很有趣。
I think it possible that she would like to help you. 我认为她帮助你是有可能的。
【典例1】
__is the sun that gives off light and heat, which makes __possible for plants to grow.
A. It; it B. That; those 
C. This; it D. This; them
{错因分析} 如果考生对it作形式宾语及含it的强调句型掌握得不牢固，就会造成误选。
{解析} 分析句子结构可知，第一空考查强调句型的基本结构：it is/was+被强调部分+that+句子的其他部分，故用it;第二空用it作形式宾语，其真正的宾语是后面的动词不定式。答案为A项。
【典例2】
To her joy, Della earned first the trust of her students and then __of her colleagues.
A. that B. one
C. ones D. those
{错因分析} 很多考生看到横线后的of就错误地选择了B、C项，没有弄清句子要表达的意思。
{解析} 句意：使她高兴的是，Della首先赢得了她的学生的信任,然后又获得了同事的信任。空后面的"of her colleagues"与前面的"of her students"是同样的结构，因此此空应该选择that来替代the trust，以避免重复。答案为A项。
【典例3】
I’d appreciate __if you could let me know in advance whether or not you will come.(2014·陕西)
A. it B. you
C. one D. this
{错因分析} 考生如果没有掌握这个知识点"英语中动词appreciate, enjoy, like, dislike, love, hate, prefer等之后，常用it+when/if从句"，在做此题时就很容易误选选项。
{解析} 句意：如果你能够让我提前知道你是否要来，我会非常感激。根据句子的结构，此空在句中作形式宾语，而真正的宾语为if所引导的从句，故要用it。故答案为A。
第三，含it的固定用法
forget it没关系，休想，不必在意
get it 明白了，理解了，知道了 
I can’t help it我没办法 
make it 获得成功，幸免于难
as it is 照现状
It depends.看情况而定。
Don’t mention it.不客气。
Take it easy.别着急。
believe it or not 信不信由你
see to it that ... 确保……
depend upon it ...请相信……
take it for granted that...认为……是理所当然的
It makes no difference at all.一点关系也没有。
It’s hard to say.很难说。
It won’t do.不行。
fight it out 辩论出结果
How comes it?这是怎么搞的?
make a day of it 痛痛快快玩一整天
nothing for it 别无他法
以上是学大小编为大家整理的高考英语语法辅导-it的固定句式讲解，更多内容请关注学大教育官网高考英语栏目。