Grammar 
Demonstrative Pronouns - this & that
指示代名詞 - しじだいめいし
| Example | This is a cat. That is a dog. |
Definition
Fun Fact: "The word 'therein' contains only seven letters, but it contains 10 words that can be formed using consecutive letters: the, there, I, he, in, rein, her, here, ere, herein."