1. She loves to act on stage.

2. She loves to perform on stage.

3. He started to act in school plays.

4. They acted out the story of the three bears.

5. She acts well but she hasn't got star quality.

这些例句展示了“act”作为动词时的不同用法，包括“在舞台上表演”、“在戏剧中表演”以及“表演故事”等。希望这些例句对你有所帮助。