he considers himself an expert on the subject 这句话有语法问题吗？？

Question

我认为是 he considers himself is an expert on the subject
我是按照中文翻译的就是这样？？正确吗？语法新手。。

Answer 1

原句对的he（主语） considers（谓语） himself（宾语） an expert（补语） on the subject
你的句子语法错误 he considers himself is an expert on the subject
可以改成he considers that he is an expert on the subject
原句是固定搭配
后面是宾语从句

Answer 2

应为he considers himself as an expert on the subject
consider ... as
把...看作...

Answer 3

consider作"认为"解时,后面可以接一个宾语和一个动词不定式作宾语补足语,构成复合宾语结构,但这种结构的动词不定式主要是"to be+名词/形容词"; he considers himself to be an expert on the subject

Answer 4

他认为自己在这方面是个专家，实际上，他很差。