try to do try doing regret to do regrey doing 这四个词组分别是什么意思?哪些是事情已经做了?

try to do 尽力做某事
try doing 试着做某事
regret to do 遗憾去做某事，还没有做
regret doing 后悔做过
try to do try doing regret to do regrey doing

try to do 尽力做某事
try doing 尝试做某事
regret to do 遗憾去做某事,还没有做
regret doing 后悔做过