句子文法結構的問題

This scared the school teacher, and he spurred his horse on, hoping to get past the infamous bridge.

For hours before disaster, the crew detected the pressure, suggesting that the well wasn't perfectly sealed.

請教上面兩句,關於hoping 和suggesting的文法結構,謝謝!
更新: Louis大師,謝謝說明,請問逗號可省略嗎?
3 個解答 3