None of the provided sentences include a participial phrase. A participial phrase typically begins with a present or past participle and includes accompanying modifiers and/or objects.
To clarify:
- "Please make sure you are prepared for the meeting." - No participial phrase.
- "I am hurrying to make sure I make it to class on time." - No participial phrase.
- "The small boy was afraid to jump off the diving board." - No participial phrase.
If you have additional sentences you'd like to analyze, feel free to provide them!