I think it difficult to answer this question 为什么可以it 不加is?it是形式宾语有和这个有什么关系?为什么加个形式宾语就避免句子头重脚轻了?

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I think it difficult to answer this question 为什么可以it 不加is?it是形式宾语有和这个有什么关系?为什么加个形式宾语就避免句子头重脚轻了?
I think it difficult to answer this question 为什么可以it 不加is?
it是形式宾语有和这个有什么关系?
为什么加个形式宾语就避免句子头重脚轻了?

I think it difficult to answer this question 为什么可以it 不加is?it是形式宾语有和这个有什么关系?为什么加个形式宾语就避免句子头重脚轻了?
在你的句子中it是做形式宾语的
I think (谓语动词),我想什么呢?后接宾语.此时it做了宾语,但并不是真正的宾语.因为句子是要表达:
我想回答这个问题不是很难.那真正的宾语就是to answer this question
(it只是代替了宾语罢了)
为了帮助你了解解释一下形式宾语
 英语中,常用“it”作形式宾语代替宾语从句,把真正的宾语从句后置,特别是在带复合宾语的句子中.
“it”充当形式宾语,宾语从句后置的情况有下列几种:
  一、在believe,consider,declare,estimate,fancy,feel,find,guess,hear,imagine,know,make,prove,reckon,think,understand 等动词接复合宾语(宾语+宾补)时,要用it作形式宾语.在这种结构中that不可省略.例如:
  We find it difficult that we should finish the work on time.我发现我们按时完成工作有困难.
  She thinks it wrong that he didn't answer the phone.她认为他不接电话是不对的.
  二、由动词和介词构成的短语动词后接 that 宾语从句时,要用形式宾语.例如:
  We are thinking of it that we'll lend you some money.我正在考虑借给你钱的事.
  三、用于“动词+宾语+介词短语”的句型中.例如:
  Keep it in mind that you have to be home by ten o'clock.要记住你得十点钟之前回家.
  四、不可直接接宾语从句的情况.
  在like,enjoy,love,hate,take 等表“喜怒哀乐”的动词,后若要跟宾语从句,需跟形式宾语 it.
  I hate it when people talk with their mouths full.我不喜欢人们满口饭说话.
  五、不可直接跟that从句的情况.
  下列动词不可直接接that从句:ask,refuse,let,like,cause,force,condemn,admire,celebrate,entreat,dislike(厌恶),overlook,love,help,take,forgive,bid,hate,hear(听见),see(看见),want(想要) 等,但可用it,the fact做媒介,后接that从句;或接动名词、不定式.例如:
  He overlooked it that he had made another mistake.
(正确) 他忽视了一件事,他又犯了一个错误.
  He overlooked the fact that he had made another mistake.(正确)
  He overlooked that he had made another mistake.(错误)
  I admire it that they won the match.(正确)
  I admire the fact that they won the match.(正确) 我很羡慕,他们赢得了比赛.
  I admire that they won the match.(错误)

口语

it 是个形式宾语,真正的宾语是to answer this question
也就是:I think to answer this question (is) difficult.
在think, believe , find 等动词后,可以用IT作形式宾语+形容词+不定式

如果加了is就变成定语从句了,不加is,it所代表的是answer this question ,至于头重脚轻是说这个宾语太长了,而宾语补足语difficult太短造成的。

其实加is和不加is都可以 只不过解释不一样
I think it difficult to answer this question 。此句中it做形式宾语。真正的宾语是动词不定式
I think it is difficult to answer this question 此句中,think后省略了关系词that ,
that引导宾语从句,在从句中不做成分可以省略。...

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其实加is和不加is都可以 只不过解释不一样
I think it difficult to answer this question 。此句中it做形式宾语。真正的宾语是动词不定式
I think it is difficult to answer this question 此句中,think后省略了关系词that ,
that引导宾语从句,在从句中不做成分可以省略。it是形式主语,is是谓语动词,动词不定式做真正主语。
为什么加个形式宾语就避免句子头重脚轻了??
这是英语表达习惯问题,经常使用it作形式主语或者宾语,避免由于宾语过长使句子看起来罗嗦。

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it是形式宾语,真正的宾语是后面的不定式to answer this question,difficult是宾补,补充说明宾语to answer this question的,那么为什么要用形式宾语it呢?正常语序应该是I think to answer this question difficult .那么宾语太长,宾补就只有difficult这么一个词,显得很不相称,所以就用形式宾语it,把真...

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it是形式宾语,真正的宾语是后面的不定式to answer this question,difficult是宾补,补充说明宾语to answer this question的,那么为什么要用形式宾语it呢?正常语序应该是I think to answer this question difficult .那么宾语太长,宾补就只有difficult这么一个词,显得很不相称,所以就用形式宾语it,把真正的的宾语to answer this question放在后面。
至于你说的那个is,可以这样用:I think it is difficult to answer this question .那么此时就不是宾语与宾补的例子了,而是成了宾语从句,主句是I think ,主句主语是I ,谓语是think,it is difficult to answer this question 做的是主句谓语动词think的宾语,在这个宾语从句中,it是形式主语,is是系动词,difficult是标语,to answer this question则是宾语从句中的真正的主语。
希望帮助到你,学习进步。

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