[ no passive ] to start doing sth :
She set about the business of cleaning the house.
[+ -ing ]
We need to set about finding a solution.
[ no passive ] to start doing sth :
She set about the business of cleaning the house.
[+ -ing ]
We need to set about finding a solution.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005