动名词，在一个句子中，等于名词。
- Seeing is believing.
- Running a marathon is not an easy thing to do.
- Watching TV is sometimes harmful.
- Eating is always fun.
- My hobby is painting.
- She loves babysitting her sister.
- I like listening to music.
- I wasted all my afternoon by taking a nap.
- I am afraid of singing a song on a stage.
- I hope that you don’t mind my using your pen.
- Don’t be mad about my leaving early.
- I don’t want you misunderstanding.
- You will be amazed by my writing.
