宾语补足语

Question

I think it necessary that we take plenty of hot water every day .

　　I feel it a pity that I haven’t been to the get-together.
　
　　I have made it a rule that I keep diaries.

　　We all find it important that we (should) make a quick decision about this matter.
这四句话的宾语补足语是什么？怎么判断的，怎么还原这些句子，请高手告诉下谢谢了

Answer 1

分别是necessary、a pity 、a rule 、important
这四个句子属于一个类型，都是用it 充当形式宾语。找宾补，先找到宾语，然后看宾语与其后的词/ 短语是否可以构成一个带be的表语从句。如：
第一句中宾语是it (that we take plenty of hot water every day 是真正的宾语），与其后的necessary可以构成it is necessary,句子正确，所以necessary是宾补，否则为直宾。