I consider him as a clever pupil.这句话错在哪里？

认为;把...视为
We consider that the defendant is not guilty.
我们认为被告无罪。
Michael is considered an expert in computer science.
迈克尔被认为是位电脑专家。
Jean considered herself (to be) very lucky.
琼认为自己非常幸运。

所以这里应该说，I CONSIDER HIM（TO BE） A CLEVER PUPIL。

应为I consider him a clever pupil
consider sb sth 动词+宾语+宾语补足语

那句没错，consider 与think regard用法一样，表认为，加宾补 to-v(动词),n(名词)或as．另外consider 还有考虑的意思，1 All things considered，...... 2 Considering sth adj,.... 是最经常考的．注意consider 的主语就可以了

I consider him a clever pupil.才对。