复合不定代词是英语语法中的一部分，可以代替不确定的人或物，并在句子中作为主语、宾语、表语、定语等。例如，"Somebody needs to clean the kitchen before dinner"，"Does anybody want to go to the movies tonight?"，"No one can predict the future"等。
1. somebody/someone/somebody else
- Somebody needs to clean the kitchen before dinner.
- Someone has left their umbrella here.
- Somebody else is using my computer.
2. anybody/anyone/anybody else
- Does anybody want to go to the movies tonight?
- Anyone can learn a new skill with enough practice.
- Is anybody else coming to the party?
3. nobody/no one
- Nobody knows the answer to that question.
- No one can predict the future.
- Nobody called me back after the interview.
4. everybody/everyone/everybody else
- Everybody loves a good surprise party.
- Everyone should have equal rights and opportunities.
- Everybody else is already there waiting for us.
5. something/someone/somebody else
- Something smells delicious in the kitchen.
- Someone is knocking on the door.
- Somebody else is using my favorite mug.
6. anything/anyone/anybody else
- Is there anything else you need from the store?
- Anyone can achieve their dreams with hard work and determination.
- Does anybody else know the answer to this question?
7. nothing/no one
- Nothing is more important than family.
- No one is perfect, we all make mistakes.
- Nothing happened while I was away on vacation.
