n.注册; 签约;
例句:
To sign up for membership, please fill in the form.
要申请会员的话, 请填表.
Your brother did sign up for the tennis club, did he?
你弟弟签约网球俱乐部了, 不是 吗 ?
Your brother didn't sign up for the tennis club, right?
你弟弟签约网球俱乐部了, 对 吗 ?