Pronouns:
* He, she, it, they, we, you, I: These are the most common and versatile options. They replace a noun depending on its gender and number.
* Him, her, them, us, you, me, it: Used as object pronouns.
* His, her, its, their, our, your, my: Used as possessive pronouns.
Demonstrative Adjectives:
* This, that, these, those: These words refer to something already mentioned, replacing the need to repeat the noun.
Other options:
* The same: "The same" can be used to refer to the previously mentioned noun. Example: "I bought a blue shirt yesterday, and I want to buy the same one today."
* Such: "Such" can also be used to refer to something already mentioned. Example: "I saw such a beautiful sunset last night."
* One/Ones: "One" or "ones" can be used to refer to a previously mentioned noun, especially when it's countable. Example: "I bought a new car last week. It's a blue one."
Examples:
* Original: "The cat is on the mat. The cat is sleeping."
* Using a pronoun: "The cat is on the mat. It is sleeping."
* Using a demonstrative adjective: "The cat is on the mat. That cat is sleeping."
The best choice depends on the context and the specific noun you are trying to avoid repeating.