1·Sign up for management classes, so you'll be ready to join the family business when you graduate.
报名参加管理课程，这样你就可以在毕业时加入家族企业。
2·You just sign up to be on the team of whoever you can gather.
你只要报名加入你能召集的任何人的队伍。
3·I'd like to sign up for some voluntary work with the environment council.
我想报名参加一些环境委员会的志愿工作。
4·Why not sign up for the lessons offered by the physical education department?
为什么不报名参加体育部开设的课程呢？
5·If we both sign up before Friday, we can get a discount on a six-month membership.
如果我们都在星期五之前报名，那么办理六个月的会员会有折扣。