To act like that is foolish.
动作还未发生，表示将来或习惯性动作。
Walking is good exercise.
描述一种普遍认可的活动或状态，用作表语。
Having been shown around the lab, we were taken to see the school library.
完成某个动作后，再进行的另一个动作，用作时间状语。
Owing to the remarkable development in mass-communications, people everywhere are feeling new wants and are being exposed to new customs and ideas.
由于大众传媒的显著发展，人们到处都感受到新的需求，不断接触到新的习俗和思想，用作原因状语。
Doing yoga every morning helps me stay calm and focused.
描述一种习惯性的活动及其带来的好处，用作主语。
Having completed the project, they celebrated their success.
完成某个任务后进行的庆祝活动，用作时间状语。
To learn English well, we must study hard.
表示目的或意图，用作目的状语。
To be done
表示被动和将来，用作表语。
这些句子展示了非谓语动词在句子中的不同用法，包括作为主语、宾语、定语和状语等。希望这些例子能帮助你更好地理解和掌握非谓语动词的用法。
