Final answer:
Expressions such as Oh my, oh my God, or oh boy fall under the category of expressive language. They are used to convey the feelings or emotions of the speaker/writer and can be kept in both written and spoken forms.
Step-by-step explanation:
Expressions such as Oh my, oh my God, or oh boy fall under the category of expressive language. This use of language is neither true nor false and is used to convey the feelings or emotions of the speaker/writer.
Expressions like these are commonly used in informal speech and writing. They add emphasis or convey surprise, excitement, or frustration.
Therefore, regardless of the verbatim type (e.g. written or spoken), these expressions can be kept as they serve a specific purpose of conveying emotions or reactions.