i think this question easy to answer.是不是正确?

i think this question easy to answer.是不是正确?
i think this question easy to answer.
当然还有另外一句,i think this question is easy to answer.　肯定是对的.
为什么?
think 的用法中用这几点好像与这个问题有关,但还是不能确定.
（本例句中是this question　而不是it ,到底能不能用第3点来判断上面的例句是错的?）
1．think+名词或代词
I'll think the matter over．这事我得仔细考虑.
2．think+名词或代词+名词或形容词（宾补）
He thinks himself very clever．他认为自己聪明.
3．think＋it（形式宾语）+形容词或名词（宾补）+不定式／动名词／从句（直接宾语）
I don't think it possible to master a foreign language without much memorywork．
我认为没有大量的记忆劳动要掌握一门外语是不可能的.