sign up for
volunteer for
register for
agree to
1. He decided to sign on for the new project.
他决定参加这个新项目。
2. Many people have signed on for the charity work.
许多人都报名参加了这项慈善工作。
3. She signed on for a five-year contract.
她签署了一份为期五年的合同。
A: Are you going to sign on for the volunteer program?
A：你会报名参加这个志愿者项目吗？
B: Yes, I already signed on for it yesterday.
B：是的，我昨天已经报名了。
1) 报名参加某项活动
2) 签约或承诺承担工作
3) 同意参与某项计划
1. 报名参加；签约
e.g.
He signed on for the job.
他签约了这份工作。
phrase
1. To formally agree to do something or to commit to a task or organization.
Synonym: enroll in, join