The guide's loud voice interrupted Connie's thoughts. would it be guide's voice?

"Voice" is the simple subject, if that is what you are asking.

The simple subject is VOICE. The comple subject is THE GUIDE'S LOUD VOICE.

To determine if it should be "guide's voice" or "guide's loud voice," we need to consider the possessive form of the noun "guide."

Here's how you can identify the correct possessive form:

1. If the noun is singular and does not end in "s," you can usually form the possessive by adding an apostrophe and "s." For example: "The guide's voice," "The cat's tail," "The teacher's desk."

2. If the noun is singular and ends in "s," you can still form the possessive by adding an apostrophe and "s." For example: "The hostess's greeting," "The witness's statement."

3. If the noun is plural and ends in "s," you typically just add an apostrophe. For example: "The travelers' guide," "The cats' toys," "The teachers' lounge."

Based on these rules, "guide" is a singular noun and does not end in "s." Therefore, the correct possessive form is "guide's voice."