One can utilize "This, That" as a/an -

• One can utilize "This, That" as a - Demonstrative Pronoun.

• Demonstrative Pronoun:
- ব্যক্তি বা বস্তুকে যদি এটি, ওটি, এগুলি, ওগুলি ইত্যাদি শব্দ দ্বারা নির্দেশ করা হয় তাহলে এই শব্দগুলোকে বলে demonstrative pronoun.
যেমন: this, that, these, those.

• Pronoun ৮ প্রকার।
যথা-
1. Personal Pronoun (He, I, we, me, it),
2. Demonstrative Pronoun (this, that),
3. Interrogative Pronoun (what, who),
4. Relative Pronoun (what, who, that),
5. Indefinite Pronoun (one, some, any, all, many),
6. Distributive Pronoun (each, every),
7. Reflexive Pronoun (myself, themselves),
8. Reciprocal Pronoun (each other, one another).

Source: A Passage to the English Language by S. M. Zakir Hussain.