Reflexive Pronouns

The following are reflexive pronouns:

A reflexive pronoun usually refers to the subject of a sentence:

--We looked at ourselves in the mirror.
(We and ourselves are the same persons.)

Sometimes reflexive pronouns are used for emphasis:
--I washed my clothes myself.

The Relative Pronouns Whom/Which/That

Follow the same rules for using who(m), which, and that, as you do with other relative pronouns. The only difference is that now these pronouns are functioning as objects:

--The movie that we saw last night was terrible.
--The movie, which we saw last night, was terrible.

For people, you will use either who or whom. Who is usually used instead of whom in colloquial speech, even though it is technically incorrect:

--The person who they saw was sick. (informal)
--The person whom they saw was sick. (formal)
--There's the driver who the police arrested. (informal)
--There's the driver whom the police arrested. (formal)

Demonstrative Adjectives and Pronouns

To differentiate between things in English, use either:
this
that
these
those

Any of these demonstratives can be used with a noun or by itself. This (singular) and these (plural) refer to something or someone close at hand. That (singular) and those (plural) refer to something or someone a bit farther away.

EXAMPLES:

--Do you want this box or that box?

--I'd like some of that popcorn.

--Do you want these or those?

--This apartment is nicer than that one.