Here are some examples of adverbial phrases:
1. "By the river"
They enjoyed a peaceful walk by the river.
2. "With a smile”
He greeted the guests with a smile.
3. "In the morning"
She goes for a run in the morning.
4. "In a loud voice"
She shouted in a loud voice.
5. "With great enthusiasm"
They sang the national anthem with great enthusiasm.
6. "At midnight"