Question

his English knowledge is poor.correct the error please perfectly....

Answer 1

His knowledge of English is poor.

It is correct formation.

Answer 2

Correct answer is “His knowledge of English is poor” so that the meaning of the sentence would not be changed.

Despite the fact that your word choice is incorrect and a sympathetic listener may try to understand the meaning, as opposed to being a critic.

What the listener may take away from the given sentence posed by the author could be used.