Question

change the voice of the given sentences 1) i reads a story​

Answer 1

In passive voice– A story is read by me.

Answer 2

It is in active voice.

Here the subjective noun(I) is used as a subject and no conjunction of by is mentioned.

There is an error in your question.

I read a story is that correct statement .We add s/es in verb next to third person singular (He,she,it) in simple present tense.

The passive of this sentence is

A story is read by me.