e used to do 被用来做 be used to doing/sth 习惯于 used to do 过去常常 go on /start等一些单词后加 to do (不同的事) doing (同一种事) attend a meeting/a leature/a club attend school=go to school join +sb 组织 兴趣小组 take part in =join in +活动(学科竞赛) 报名参加 enter for try to do 努力做某事 doing 尝试做某事 这些是我有点搞的(自己整理),不知有用否.