莱曼说三道四话英语 英语基础知识中的【 It 主导的句型】问题*****莱曼说三道四话英语
英语基础知识中的【 It 主导的句型】问题 在英语学习中，一定要注意其重点词的用法。它们往往亦或用在固定词组中，亦或用在固定句型中。做为一个普通的代词 it 却有着与众不同的用法。因为 it 即可以代指物体，也可以代指事情，还可以代指未谋面的人。
在莱曼倡导的“金字塔学习理论”中，it 做为形式主语的用法应该是塔尖上的用法。 所谓的形式主语，就是用 it 做主语，代指事情，而真正的主语被放到了句尾，用以补充说明。此类由 it 主导的句型应该被视为重点句型，加以重点学习和板块状系统复习。
1. It is easy ( difficult / important/ necessary/ useful/ good/ helpful,)for sb. to do.........
2. It takes sb. + time/ money to do.....
3. It seems that.......
4. It is said (reported/ believed) that.......
5. take it for granted that......
6. It is my great pleasure to do.....
详解辨析：
1. It is easy (difficult/ important/ necessary/ useful/ good/ helpful) for sb. to do......
此句型中， it 为典型的形式主语，代指一件事，而真正的主语 to do.....置于句尾。
It is easy for us to preserve the earth and to protect animals,for they are our home and neighbors.
It is helpful for us to cultivate some hobbies so that we can have more opportunites in the future.
It is difficult for scientists to know the whole universe,for it is so huge that we can reach neither the margin of it nor the center of it .
2. It takes sb. + time/money to do....
该句型中为形式主语，而谓语动词为 take ，应注意其各种形式的变化。同时，还应该注意，有时 it 也可用真正的主语替代，如，the party,the dinner,swimming,exercising the piano 等。
It took him 3 hours to get here by bike. The party took him 3 hours.
Exercising the piano takes him nearly an hour every day.
重难点：take 有“占有、花费”之意，但要与 spend, pay, cost 区别开来。
3. It seems that......
本句型 that 之后要跟从句，也即一个完整的句子，并要注意与前面的 seem 时态呼应。
It seems that he is going to help the students in the poor area.
It seemed that they did something wrong with their lessons.
4. It is said ( reported, believed) that......
注意该句型中被动语态的用法，同时，还应注意的是， that 之后要跟从句，即一个完整的句子。
It is said that you must have a pair of standard eyes if you want to join the air force.
It was reported that the famous actor had moved to the United States of America.
5. take it for granted that.....把.......认为是想当然的。
此句型中， take 有“认为”之意，而 it 代指一件事，这件事则是指 that 之后从句中所描述的事情。
I took it for granted that he had got the first prize in the race.
Most Chinese parents take it for granted that young kids should learn English well.
6. It is my great pleasure to do.....
It is my great pleasure to see you here.
It is my great pleasure to help you.
莱曼英语在教学实践中，总结出的各类语法点分别以【莱曼说三道四话英语】的形式，尽可能以短小的篇幅，汇总某一板块的语法点，并通过短小精悍的例句加以说明和展示，望能够帮助英语学习中。更多内容请见我们的网站。
