英语句子划分语法结构。还有补语是哪个，为什么？

Question

I think that your brother is a clever boy.

Answer 1

I（主） think（谓）   that your brother is a clever boy （that引导的从句为think的宾语，that在从句中不做成分）.

your brother（从句主语） is（从句系动词） a clever boy（从句表语，亦可理解为从句主语的表语——对从句主语your brother进行补充） 

Answer 2

I 主语
think谓语
that your brother is a clever boy.宾语从句
your brother 从句主语
is 从句系动词
a clever boy从句表语
这里没有补语

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Answer 3

I think that your brother is a clever boy.
that引导的宾语从句， your brother is a clever boy.整个句子充当think的宾语，没有补语。

Answer 4

i 主语，谓语think， that your brother is a clever boy当 think的宾语