set down to do 还是 doing
set down to do 还是 doing
set off to do还是doing?
set out 加to do还是doing?
set off doing还是set off to do
set out后接doing还是to do
静下心来做某事是settle down to doing 还是 to do
set one\'s mind to do sth 还是set one\'s mind to doing sth doi
get down to后接do还是doing,
come down to后面加do 还是doing?
get sb down后面加doing还是to do?
turn down 后面跟to do还是doing还是 to doing?
get down to do还是get down to doing是开始从事的意思?