Ex. 1- Relative Pronouns as Subject and Object: that, which, who, whom

Instructions. Decide whether the underlined pronoun can be omitted or not.

Explanation

The relative pronouns that, which, who, and whom can be omitted when they occur as the object of a verb or the object of a preposition.

I saw a movie that I really liked the other day.
That is the object of liked, so it can be omitted.
I saw a movie I really liked the other day.

I don't like movies that have a lot of violence.
That is the subject of have and cannot be omitted.

I think the person who I talked to on the telephone was the manager.
Who is the object of the preposition to and can be omitted.
I think the person I talked to on the telephone was the manager.