Question

to told you about this convert into passive​

Answer 1

Explanation:

Who told you this?

He told you this.

You were told this by him.

You were told this by who? → By whom were you told this?

.

Who gave you this pen?

He gave you this pen.

You were given this pen by him.

You were given this pen by who? → By whom were you given this pen?

.

When the active sentence has two objects, in general, choose the one directly following the verb to promote to the subject position in the passive construction.