4,happen to do sth 5,as (so) as to do sth 6,manage to do sth 7,mean to do sth/ mean doing sth

问题描述:

4,happen to do sth
5,as (so) as to do sth
6,manage to do sth
7,mean to do sth/ mean doing sth

碰巧做某事
不知道
设法做某事
打算做某事/意味着