有decide doing sth.吗?为什么书上写decide on(upon) sth./doing sth.?

1、只有 decide to do sth；
2、decide on (或upon) （1）决定要,就…做出决定,对…做出决议：
She has decided on art as a career.她决定选择艺术为职业.
I've decided on going there.我已经决定到那儿去.
（2）选定：
I've decided on a new computer.我已经选定一种新计算机.
Has the list of candidates been decided upon?候选人名单确定了吗?