set about; set to do

set about; set to do set to do set about doing有这种用法吗?和set out to do 意思一样吗? set out to do 是什么意思 set out to do remember get down to 与set about to set off doing还是set off to do 辨析：set about ,set out ,set down ,set up set out set off set about set down set up ,set about ,set down ,set out用法?set about ,set out区别? set to set down \ set off \ set up \ set aside \ set about \ set ou