1. I think this question easy to answer. （正）

2. I think this question is easy to answer. （正）

这个问题，涉及think 的用法问题。具体说，是think 的句型问题。

第一句的结构是：think + 宾语 + 形容词 （动+宾语+宾补）

第二句的结构是：think + (that) 宾语从句 

英语中还有一个类似的结构，我给总结归纳如下：

英语的“6123 结构”是什么意思？

有这样一个句子：You may find it difficult to communicate with him. 你可能发现跟他交流很困难。

本句含有一个常见的句型结构：find + it + adj. + do。句中的it作形式宾语，真正的宾语为不定式，astonishing 为形容词作宾语补足语。又如：

We found it quite pleasant to work with him. 我们发现跟他一块工作很愉快。

I felt it hard to communicate with them. 我感觉难以跟他们交流。

He considers it quite foolish to do like that. 他认为那样做很愚蠢。

该句式中的it 作形式宾语。为了记忆方便，我们称该句型为“6123结构”。

“6”指主句中6个常用动词：think, consider, believe, make, find, feel。“1”指形式宾语it ；“2”指宾补的两种形式：形容词或名词；“3”指真正宾语的三种形式：①不定式短语，②动名词短语，③that引导的宾语从句。

This special strain of rice makes it possible to produce one-third more of the crop in the same fields. 这种特殊的稻种能够在同样的田里增加三分之一的农作物产量。（必修四第2单元）

This produced a chain reaction, which made it possible for life to develop. 这产生了连锁反应，使得生命孕育发展成为可能。（必修三第4单元）

He didn’t make it clear when and where the meeting would be held. 我们还没弄清楚会议将在何时何地召开。

She made it a rule to get up at six and take a walk in the morning. 她在早晨六点起床然后散步已成为习惯。

Do you find it funny to see someone sliding on a banana skin? 看见有人踩在香蕉皮上滑倒，你觉得有趣吗？

The teacher feels it his duty to help the student with his English. 老师感到，帮助学生学习英语是自己的责任。

We thought it necessary that the two sides should stop arguing. 我们认为，双方停止争论是必要的。

I consider it rude to stare at other people. 我认为，眼睛盯着别人看是无礼的。

We believe it useless reading without understanding. 我们认为，不理解的情况下阅读是没用的。

He considered it a good thing that the parliaments would be involved. 他认为，议会将卷入其中是好事一桩。

Ann felt it an justice that she had been automatically blamed. 安觉得，她已自动接受职责是公正的。

They find it a mystery that he has never mentioned his parents. 他从来没提到过自己的父母，他们发觉真是个谜团。

We consider it necessary that the machine should be oiled regularly. 我们认为，有必要对这台机器经常加油润滑。

Under the circumstances I feel it right that you should know. 在这种情况下，我觉得你应该知道。

I found it strange that she had not come yet. 她竟然没来，我发现奇怪。

Mr. Black made it clear that the students should prepare every lesson. 布莱克先生明确指出，学生应准备每一节课。

I think it important that we should keep calm. 我认为我们保持冷静是很重要的。

I find it difficult to do the job well. 我发现做好这件事不容易。

I consider it best that you should stay here. 我认为你最好住这儿。

I find it easy to get on with her. 我发现她很容易相处。

They haven’t made it known where they are to hold the conference. 他们还没宣布会议在哪里开。