Who and Whom

[5jj]

Mr Johnson is the one who was chosen to be the chairman of the company.
I prefer who instead whom.

Good. 'Whom' is incorrect.

who and whom are both refer to people.
who refers to the subject, whereas whom refers to the object.

Fine, but as four native speakers (three of them teachers) have said, most people do not use 'whom' except after a preposition. Even then, most of us say, for example, "Who should I give the ball to" rather than "To whom should I give the ball?"

[emsr2d2]

Mr Johnson is the one who was chosen to be the chairman of the company.
I prefer who instead of whom.

"Who" and "whom" are both refer to people.
Who refers to the subject, whereas whom refers to the object.

As an English teacher, Mohammedhelmi, please ensure that you use correct capitalisation etc in all your posts. The learners will look to your posts as being examples of correct English.

[Tdol]

who refers to the subject, whereas whom refers to the object.

This is a view, but usage does not reflect it- who can be used for the object in a lot of cases.