动名词前省略介词 in 的常用结构
46.be careful (in) doing sth做某事时很小心
47.be busy (in) doing sth忙于做某事
47.be fortunate (in) doing sth很幸运做某事
49.be late(in) doing sth做某事做晚了或做迟了
50.have luck(in) doing sth做某事时有运气（走运）
51.have difficulty(in) doing sth做某事有困难
52.have trouble (in) doing sth做某事有困难
53.have bother(in) doing sth做某事费劲
54.have a problem(in) doing sth做某事有困难
55.have a good time(in) doing sth做某事很开心
56.have a hard time(in) doing sth做某事很辛苦
57.find diffuculty(in) doing sth做某事发现有困难
58.lose no time(in) doing sth马上做某事
59.spend money(time) (in) doing sth花钱（时间）做某事
60.waste money(time) (in) doing sth浪费钱（时间）做某事
61.There is no difficulty(in) doing sth做某事没有困难
62.There is no point(in) doing sth做某事没有意义
65.waste money(time) (in) doing sth浪费钱（时间）做某事
66.There is no use(in) doing sth做某事没有用