Formal:
* The author used colloquial language to create a sense of realism in the dialogue.
* She often uses colloquialisms in her writing, which can sometimes alienate readers unfamiliar with her dialect.
* Colloquial expressions can vary significantly between regions and social groups.
Informal:
* I couldn't understand what she was saying because she was using all these colloquialisms.
* He's so colloquial, he uses slang words even in formal settings.
* I love the way she writes, it's so colloquial and relatable.
Note: "Colloquial" is often used to describe language that is informal, casual, or specific to a particular region or group. It's important to consider the context and audience when using this term.